She wants to be there because it's good for the gram, plus she might get a free party house for her birthday. On the other hand, she doesn't want to be there because she may have to eat and drink. In addition to this, she doesn't know how to interact with other people, she can talk about herself and brag but she can't listen to other people, ask questions and have a conversation. This is why she never sticks around long, she swoops in, gets her photos and leaves. Once home, she brags about how fabulous it all was and how much she loves her friends, obviously they are all gorgeous and fabulous because she would NEVER be friends with someone plain and ordinary.