Never felt more used/abused....

So about a week or 2 ago I took my little sister (18) to a Post Malone concert. It was her first concert and her favorite artist. I took her because I wanted her to have fun and destress from her life a little bit. She’s working, in high school, and is pretty much homeless. She left my moms home because my mom is abusive. She can’t live with me because I live 30 minutes away from her school and job and she doesn’t have a car. So she’s living with a friend for now. I spent hundreds on the trip to the concert. I just wanted to do something fun and nice for her. Well, we had a blast on the trip. We get back and now she wants nothing to do with me at all. She won’t talk to me, won’t text me. Nothing. Idk what I did. We had such a good time. I’m heartbroken because her and I have always been super close. I love her so much and now she wants nothing to do with me....

* My sister and I lived together our whole lives till I got married last year. We were in the same home with the same mom. She’s not protecting herself from hurt. She knows I’m not gonna ask her for a thing. She was elated to go to the concert. I bought her food and gave her an escape she needed. I’ve tried to give her thing’s and she doesn’t want to take them. I even bought her a Bed.