Shortandcute -- Just playing devils advocate here, but couldn't you have called her when you were SICK and told her you were ill? I mean, it only takes a couple of minutes to make a phone call. At least she would have known you were sick, and couldn't make it out to even MAIL a card. Then maybe she wouldn't have pasted all that stuff all over Facebook.
I'm sure she WAS hurt that you couldn't even call her. I would be. Yes, she was childish for putting that all over facebook,, but she was very hurt too.
You have no idea how it feels when children ignore your birthday. Unless of course she's forgotten yours!

Hugs, Lee