Wouldn't it be easier and cheaper in the long run to just to direct deposit to the rental company? Or hand her money in an envelope saying RENT and tell her "I don't have any more money. If you need food, you need to go to a food bank or
drop-in centre to eat" Imagine her waking up during normal working hours let alone going to a place like that. Maybe she could find another homeless man to fuck on a rock!
If they stopped putting money into her bank account (and hopefully stop handing her cash) she would be below the maximum amount allowed by Welfare to recieve financial assistance. Not sure how much rent is versus Welfare, but in most cases pretty much the whole cheque would go to rent. She might have to sell the car too, since it's an asset, but she can barely fit in it anymore anyways. Either that or transfer the name over to someone else, like her mom. Maybe some deal like "I can help you out to keep your car, but no more money"