I am so, so sorry to hear this. What a nightmare, and no good options at hand. The next step really is on your daughter, who has now destroyed her living situation in impulsive rage. I have no suggestions that you haven’t already thought over. But please don’t take your daughter’s accusations to heart. No one is destroying her life but herself. It’s horrible to hear her words but they aren’t true. And if you raced to the rescue as your sister has done in the past, you would not be able to accomplish anything positive because of your daughter’s impaired thinking and perceptions. It is so hard to accept this, and while coping with this you also face judgmental words and attitudes from your sister. I am so very sorry. Sending love, hugs, and prayers for you and your family.