Parent Took Out $4500 From My Joint Account

hi, i just need a bit of legal/financial advice on what to do. pls consider taking 5 mins to help me—i would rlly appreciate it.

i am the primary owner of the checking account but my parent is listed as a co-signer. without my permission, my parent took out $4500 after i left home (abusive situation). i had about $12200 of my own money in the account (i have pay stubs, dates, etc.) and none of it, other than maybe $100 was contributed by them.

i desperately need this money back to be able to afford a car/rent in the next few months. is there anything i can do to get it back or is the money lost since they’re a co-signer on the account?