Go talk with your financial aid office. Find out if there still is time for you to borrow the sophomore year federal student loan. That would be $6500. You could put it into the bank and use it in a future year. Depending on how your CC handles its summer session, that might be possible. Then for academic year 2019-2020 you would borrow the junior year loan of $7500 for whichever place it is that you do decide to attend. While this won’t magically reduce your and your mom’s potential total debt burden, it will shift more of it onto you alone.
If your mom co-signs rather than borrowing parent PLUS loans, look around for affordable life and disability insurance policies for yourself in the amount of your co-signed loans. That way if something truly unfortunate should happen to you, she won’t be left owing that loan.