I agree with funding her school....to a point. If she is unwilling to reconcile or do anything to assist in fixing your relationship, I would then pull funding after this school year. School is vitally important in this day and age, it is also underappreciated by the kids what an expense and sacrifice it is. Just my .02.
I am sorry about your parents. That has to hurt. Unfortunately, at this juncture in their lives, they are unlikely to change much if at all. I would not expect that. When I was your daughter's age, I think I was the most self absorbed and dramatic person on the earth. I have told my family I am so sorry over and over, luckily they forgave me. I hope this too is just a stage your daughter is going through as it was for me. I can only say that time changed me...a lot.
Good luck and God Bless to you and your family!