Yep exactly, basically she is one of those friends that you can hang out with to just enjoy some company but I wouldn't count on her to be there when things get bad or for her to stay if she found someone else she'd rather spend time with. Honestly I think most people are like that, it's so common that I just never get close to anyone. In fact, I do remember someone else responded on a thread I created a while back that when people say they're best friends with you or even just close friends, that's probably how they feel at that particular moment in time but that feeling may be fluid and could change very quickly which makes perfect sense. I've seen people who claim they are the closest of friends and who are seen literally everywhere together just suddenly hate each others guts which is actually quite sad seeing that happen to be honest.