Im 16,my mom was in a crisis center,my uncle got guardianship of her,shes fine now. He wont let her move out. How do we get guardianship of her back?

Your mom will have to apply to the same court that did the guardianship for a "return to capacity".  In order to get the guardianship, your uncle had your mother declared incapacitated.  Now that she is better, she has to prove to the court that she is better, and will have to get a court ruling.  During the guardianship an attorney was assigned to represent your mom.  You should have that attorney's name and contact information.  Contact that attorney for assistance.