I don't know what to do about my girlfriend

Sounds like she is struggling with something. Is it you, or something else?
Maybe find out before she gets hurt.

Again?

Since she is just a girlfriend - find another one before the one you have does something really bad. She is not going to change.

Put her in rehab or get a different girlfriend.

Upgrade.. Clearly she hasnt hit bottom yet. So rehab is a waste...😷