It's hard to watch train wrecks with one's own children. My husband at one point made his grown son come over and give him his paycheck each week and they made a budget, prioritized and paid off his bills (son's mail "filing system" was under the seat of his car; he was wanted by police in 3 states but was more worried about a $10 check he'd bounced to a major grocery chain!). Sometimes getting really specific with help can help.

How much is the car payment? That would give her the car for a month and I'd think she'd fix her job situation by then, since what she has now has got to be uncomfortable for her? I'd have her bring the car payment slip and envelope to you and you write a check to them and put it in the mail (and/or go with her to pay in person).

I've never understood people who quit jobs before they get another; my husband's 1st wife's mother did that all the time (and raised her two girls). I wouldn't give up on your daughter's growing up; she is probably learning some positive things from all this. If you enforce some lessons (you won't pay her bills, am only paying/lending her the money for the car bill since you realize she needs it to find a new job, pronto!).