Is it wrong for me to feel hurt by my friend?

Last year my when I had my baby I called my best friend from the hospital and told her that I was unexpectedly scheduled for a c-section the next morning. She told me that she would come to the hospital around noon the next day. She never showed.

I didn't hear from her for weeks after that and I never called her because I was really busy with the new baby, not to mention that I was struggling to figure out what I could have done to upset her that she would just leave me hanging on the day that I had my baby.

Months later I finally got the courage to call her and it turns out that a few weeks before I had the baby she found out that her oldest daughter had lupus. She said that she had completely fallen apart after that and was so sad and depressed that she didn't want to tell anyone because it was hard for her to even talk about it.

Of course then I understood why she never came to visit me or call me and we talked a couple of times after that, but then she stopped responding to my calls again.

The last time we spoke she told me that her daughter was doing much, much better and that she had responded well to her treatments and was going back to school. Soon after that I invited her family to my other son;s birthday party and they never responded and never showed. I have sent her cards inviting them to visit and asking if we could go visit them (we live 40 miles away from each other) but have never gotten a response back.

She also stopped communicating with my teenage daughter who is her Goddaughter. She would always call her on her birthday and she missed the last two years.

The thing is, I completely sympathize wih her and I don't blame her for getting depressed and I understand how serious her daughter's illness is. I have also suffered from severe depression so I know how dibilitating it can be. I'm also prepared to accept if she tells me she just doesn't want to be friends anymore, but honestly, I'm very hurt that she never cared to see my baby.

Now, if she doesn't want to be friends, then it makes sense that that is why she has never even asked anything about him. To me, the friendship is worth saving and I can forgive her for anything. But I feel guilty because I do harbor some resentment. I do understand the seriousness of her daughter's illness but that is why I feel so guilty for feeling angry. Am I completely out of line for feeling this way?