What do I do about a girlfriend who makes horrible financial decisions?

Like we live together and we split rent we have on two occasions not been able to meet rent because she doesn’t have her half. Then when I put my half up or give it to her she goes and spends it and claims it’s a we issue we don’t have rent and I respond no it’s a you issue I meet my rent everytime you fail to get your half. She was recently out of work for a week for something her employer caused and would not try to do workman’s compensation she just gave up and didn’t try to get the money back her solution was to make me try to pay double rent. So her mom just sent her rent money and when I’m at work she goes we still need 400 more dollars because she spent the 600 dollars on her credit card bills. I was fucking furious like she was dug out of a hole and instantly creates another. We got into a huge argument last night because I called her on this ignorance it’s called priorities you make sure you have a roof over your head then everything else comes second because it doesn’t mean shit if you pay your credit card but have nowhere to live.
What do I do about a girlfriend who makes horrible financial decisions?
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