I would bet she is a person that doesn't even need to be in your life anyway.
Go ahead be annoyed about it. I'm sorry someone hurt you like this. It's not fair, not fair at all.

Post whatever you want on Facebook.. hell do a " Oh isn't it great when you see someone you know and they turn the other way, WOW they are so Mature"

I'm a 8itch like that You are not failure in any aspect of your life. Childhood friend ahhh thats a funny topic. Your childhood friends knew YOU back then, they apparently don't know YOU now.. People change.. marriages, children. divorces etc.. I have 1 person from my childhood I keep in touch with.. all the others ? Pfft most I have nothing in common with, the others? somewhere along there life they became slaves to money and status... Certainly no one I want to have a friendship with.
Be upset be hurt be mad ... but don't let someone like her make you feel like you have a horrible life.