<human>: Can you give me the gist of the text in a nutshell?

A little background info:
My girlfriend is trying to save for college, and we are planning on moving out of state so that she can attend the college that she was accepted into. Both her mother and father have been far from helpful in this endeavor, by refusing to put her on their insurance plan, charging her for things I have never heard a parent charging their child for (her father is charging her for the hours he spent fixing a car that he insisted will be her first car, which she hasn't even gotten yet), etc.

To make matters worse, her mother is constantly borrowing money from her and refusing to pay it back, saying "I'm your mother, I shouldn't have to pay you back."  Today, her mother came into her work while my girlfriend was working, and asked to borrow some money, and that she will pay her back when she receives the child support check.  When my girlfriend said she did not have the money to give her, that the only money she had in her bank account was money that she owed me, her mother said that if she doesn't get money for her, then she can walk home.

Any time thisis brought up to her in any way, by my girlfriend or her father, or even her mother's boyfriend, her mother gets upset at my girlfriend and takes it out on her for embarrassing her and talking about her behind her back, or whatever her logic is for this. 

 What can I, or anyone for that matter, do to stop this? At this rate, she won't be able to afford college or even moving out to escape her mother (as melodramatic as that sounds.) My girlfriend insists anything I try, or can think of, to do will just result in her getting in more trouble, but I am sure the hivemind can think of something.
<bot>: Girlfriend's mother is making my girlfriend slowly fall into debt as college and rent (among your other average bills/expenses) loom on the horizon. What do?