I went to college, and I wasn't in class 24/7.
Frankie could have easily been in the house the day of the annual photo for those 4 years. Also, getting a degree in something does not automatically equal you getting a job in that field, as many of us here can attest.
Frankie surely went to college, got a degree in something, and wound up right back at the house doing what she probably did during pretty much her entire child/teenhood, as well as every college break she had.
I wish *I* had a family business to fall back on, I can tell you that much.