The first time my son went to jail, he promised if I would bail him out, he would do anything I asked him to, stop using, go to meetings every day and turn his life around for once and for all. He asked through tears and was very convincing so I weakened, bailed him out and we were not even home yet when he headed off to get his drugs.
Their promises may be sincere at the time but they can't even keep promises to themselves, let alone us.
I agree 100% with Anvil, or a just plain "no thanks" answer if you don't want to force her into treatment.
Good luck with this, it's hard to let our addicted loved ones fall.
Hugs