If she does it would have to be part time as, tru to form, Jack let everyone know she's a full time student learning criminal justice.
The average salary for part-timers in TN is about $28,000 per year. That gives them roughly $32,000 per year without all the shit added from before (car payments, insurance, furniture, etc)
Furniture is a little less, because they could dismantle Jr's bed and haul that off, but they're missing other things like a table or sofa will cost them.
Another cost that wasn't factored into the cost breakdown is Jr's rap career itself. He outright says he purchases beats from PQNO. The site has different ranges for what you want to do, but buying them outright for performances and mass distribution cost a damn pretty penny.