I think Maya's hair change is an indication of a change in her life, more likely a change in her relationship, and let's face it, her personal issues have already taken their toll on her relationships, she's clearly under pressure, I in her place couldn't keep up a healthy relationship, let alone a trouple.
(If I, the one watching, think that Maya is getting in the way of Josy and Fuckface, she must realize that too.)
Even in their trouple relationship there's already competition for attention, and it's always Maya who plays hard to get, I think that at any moment Maya will leave.
She likes Josy, and she also likes the MC, but maybe she doesn't want a three-way relationship, or she just doesn't have the mind to maintain a relationship at the moment.
I don't like Maya, I don't have a save focused on Maya & Josy, what I see of the relationship with them, I saw because I use mod and because I like Josy, what I wrote above does not show any option for "happy ending" with Maya, but it sure will have one, but I can't think of one.