I don't think she expected it. She's playful a lot of the time. I think there was some strange vibe she was getting from him and didn't want to be touched or have it look to be some way. She holds herself in such high regard and doesn't want to be misconstrued. She tweeted him back "XO", I've seen her not even reply. She can't be mad..
Yea she probably was uncomfortable with the touching, its not like when Drake does it because her & Drake are closer. But I doubt she's upset about it.