We didn't do so well. The best thing for both my kids was an Oxford House. At 21, she is old enough to be supporting herself. The great thing about an Oxford House is that the rent is low, in some houses, soap/paper towels/toiletpaper/laundry soap are provided as part of the rent, and the house generally requires active recovery.
You might check them out... just type oxfordhouse.org into the address line of your internet browser to find a house in your area. There is often a waiting list - so maybe she could just come home for the short period until something opens up. My kids both had to learn the universe does not revolve around THEM... Oxford Houses help with that, too.
I wish you well.