It's especially noticeable here, since you get to see Maya's entire range of emotions. Immediately after Mia talks with her (i.e., during the cross examination) Maya's obviously an emotional wreck (which, given the circumstances, is completely understandable). But it isn't long until she's almost completely back to herself, and, as Edgeworth points out, she knows that other people are hurting too, and by staying strong, she can help them (and, perhaps, herself) deal.

She's been a suspect in murder twice and she's been kidnapped.

I mean he also says "Two sisters... one a lawyer.. could this be a coincidence? I mean, they're just like...." [Pictures Ema looking sad... there is something familliar about her. Pictures Maya looking sad...]

Especially at the end of GS3, with her mother. Misty was murdered, but we still don't get to see Maya really absorb that shock. The first time I played it, I couldn't help but think the writer's were just making an excuse. The case was over--they didn't want to spend an hour comforting Maya over such a devastating loss. It's much easier to just say "I'm not sad--I still have a family!" and "She must not want Pearl to see her upset and feel guilty." But by then it was starting to feel a little creepy to me.

It's like case 5 threw out so many horrible things with Misty being murdered, and Maya almost dying, and Godot's plan going awry leading to his own eventual death...but they still tried to swing it around and end on a high note, since it was the last game. But all it left me with was a feeling of, "Bwuh?? That's...it?"

I don't think she was ever "over" Misty's death in any sense, just that she was putting her own feelings on hold to comfort Pearl. It's perfectly plausible that Maya would break down later and really mourn her mother (an extra scene would have been good, a la the airport scene). But there's nothing wrong with wanting to end on a happier note, and hoping that players will give Maya's character the benefit of the doubt.

... Plus, I don't exactly think we can expect Maya to have the same reaction over Misty's death as she did over Mia's. Yes, Misty was her mother, and yes it's awful and likely traumatizing the way it happened, but it's been seventeen years. Maya herself says that she doesn't even remember her mother. Mia was more of a mother to Maya than Misty ever was, and I think Maya's reaction after she lost her sister was more poignant than anything the writers could have done with Misty's death.

putting off her training. Mia's discussion with Phoenix doesn't exist in a bubble, it's an explanation for certain behavior that exists over the course the entire narrative.

It wasn't convenient for them to write in and flesh out Maya's reaction to her mother dying, so they didn't. There are so many different reactions she could have have, so much interesting growth that could have happened. I think if they knew they weren't going to be able to really deal with all of that, they shouldn't have gone for the shock of killing Misty in the first place. They did show her being emotional over Mia several times, but all Misty gets is, "No time for that now, happy ending coming up!"

I can't really get myself to believe that it was anything other than the writers plowing through to the ending they wanted, especially when there were so many other things they just kind of overlooked. Like the fact that no one called Godot on why he just didn't destroy the note. Or Elise, for going ahead with such a crazy plan. Godot's "love" for Mia supposedly drove him to do everything, but we don't even get to see the two of them interact once they're reunited. I know people see it differently, but to me it gave off a real vibe of "OK people, let's wrap this show up! Court's over, everyone go home!"

I think they did Maya a disservice. And Mia (come to think of it, we didn't get any insight into her thoughts on her mother being murdered, either, though I can't say I was as interested to know that).

... Now that I'm starting to think about it, there's also the possibility that Misty's actual death wasn't important. Like I said before, Misty had never been a real force in Maya's life, and the fact that she's gone isn't much different from the way things were before. It could be argued that the element of "she might come back one day" is gone, but we have to remember that by that point in the game, Maya had already accepted the fact that she was headed towards being the Master. The way I read it was that she was very much accepting the possibility that her mother would never come back.

The emphasis, therefore, shifts to the what's left of the family aspect of the Fey clan. It's discussed a lot in 3-5: the issue with fathers leaving, the conflicts between sisters for power, etc. etc., but the game itself ends with Maya following Pearl (the person she'd technically been in conflict with for the position of the Master) like the big sister she'd become. Then we have the photo Misty carried with her as a powerful final image - a mother's love for her daughters. It wasn't so much that Misty was gone for such a long time, or that she was dead, but that, despite everything, she never once stopped thinking about Mia and Maya, and that the element of familial love was something the Fey clan had been missing for such a long time.

Plus I really just can't see Maya getting emotional over Misty, since the only times we've really seen her emotional pertain to Mia. It's never been like Maya to lose control emotionally, and, again, Misty's part in her life wasn't nearly as huge as Mia's, or Phoenix's, or Pearl's, or even Morgan's to some extent.

But, all in all, I see what you're saying. Honestly, I was disappointed we didn't get to see more of Godot and Mia, among other things.