So, I was thinking. In Dipper and Mabel and the Curse of the Time Pirates' Treasure! (super underrated book btw), there's an option where as a way to deal with a dragon the twins and Blendin encounter, Mabel suggests they talk to him. The option then sees Mabel talking to the dragon and letting him vent out all his frustrations and such to her, asking how he feels and giving him advice on how to work through it and grow...almost like a therapist.
The more I look back on this as the years have passed, the more I've found this rather wholesome of a thing to have in the book. Not just cause it shows Mabel trying to help out someone per her kind nature, rather than the other option in the book for the dragon (being medieval battle, lol), but also due to the fact it can also be seen as a small reference to the fact that Mabel's inspiration, Ariel Hirsch (Alex Hirsch's twin sister), is in real life, a licensed Marriage and Family Therapist.
And in the story, some of what we hear the dragon talking to Mabel about are things like his family and life issues. It gives one an interesting thing to look into regarding Mabel and how maybe, becoming a therapist is a path she may go down, just like her IRL inspiration (kinda like how Dipper in the show mentioned he wants to make his own TV show, like Alex did). And while yeah, Time Pirates is not a canon book, it is still wholesome to consider. And now, we have kinda seen hints of that in stuff that is, like recently in The Book of Bill when Mabel mentions how she has Waddles sorta play her own therapist with who she talks out her problems with.
In the midst of all else we learn in the book, it's a bit of a small and forgotten detail but one when looked at this way, is rather telling IMO. Add on the hints at their parents marriage issues and similarities that shows with Alex and Ariel Hirsch's life we have heard from them about, and I honestly feel pretty strongly about the fact Mabel may grow up to be therapist, perhaps like Ariel, in the family and marriage field.
It's kinda interesting. For years, so many of us when headcanoning Mabel's future ambitions, look at stuff like her being an artist or maybe something similar, given it sorta seems about what you'd think she'd pursue (and I mean, the amount of headcanons and Gravity Falls AUs out there where Mabel is an artist when she's grown up, really show how prevalent the belief is). And while yeah, like all headcanons, it's just that and as valid to be true or not as any of those other ones are, I think all things considered, it's a rather wholesome and pretty Mabel outcome for her to pursue.
She's always got the best intentions at heart no matter what and wants people to be happy and comfortable with who they are. And as she gets older, she more than likely would be the type of person who'd wanna pursue that as a life ambition and career and see being a therapist as one way to achieve that. Maybe I'm thinking too much into it, but I can't lie, therapist Mabel sounds pretty interesting. It's not the usual Mabel headcanon that fans come up with...but maybe it's the start of something.