I think my sister is mad at me????

I'm not sure why or what I did but I think she is mad at me. I saw her on Friday and talked to her on Sat breifly. Everything was fine. But I called her twice on Sunday and she didn't call back and I called her Monday to see how her new job is going and she left a msg saying it was fine, kinda sarcastically. So I called her again on Tuesday and felt like I was forcing her to talk. Weird. I called her yesterday and she didn't call me back. So I don't know what is up but I'm not gonna just keep calling her if she doesn't want to talk to me.

Who knows?