Rant!!

Ok so I have a friend that's hot and cold with me. One minute I'm her best friend the nest she acts like I killed her cat. I don't get it. I'm so fucking sick of walking on egg shells around her. She is so fucking moody. She acts all high and mighty about herself like she dose no wrong but heaven forbid I have a slightly off day. How do you deal with this? I do care about her but here lately I want to smack her.