they seem to have a lot in common - mia had a rocky childhood as well, and was mainly raised by her aunt and uncle, so they'd have that to bond over. she's also traveling whenever she can (or as much as her bank account will allow her), so she'd be completely infatuated with hanna's entire life pretty much. i'm thinking she attempted college a few times but it never quite worked out - so maybe mia did a semester at psu and they became friends that way?