Thank you for your responses guys I have read all of these very carefully and appreciate each one. I feel more validated knowing that I am not coming out of nowhere with this.

Now that the initial hurt from that day is over, I am feeling like a confrontation is not going to solve anything and in a weird way I don't want to make my friend feel bad about something that she can not change, so I have decided not to talk to her about it yet. I agree with the posters on here that this behavior is coming from a place of insecurity which is precisely why I feel like it would be hard to talk her out of it... without making her feel more insecure. I've decided just to wait until this phase- if that is what it is- is over and see if my real friend comes back or not. And I hope she does!

Thanks again for the reassuring words.