Count the amount of times you have talked about your feelings and your emotions and your loss and what you would have done and what she should have done to make you feel better.
Now count the amount of times you have shown one bit of concern for her feelings.
Now come back and tell us that you aren't insensitive or selfish
Being a bereaved parent effects everything you do.
Can you imagine your child dying, your baby who you have loved since the moment of conception being taken away from you. Your baby who you have mulled over names for, bought clothes for, felt kick, spoken to, and been a Mum to for 31 weeks being taken away from you and there isn't a God Damn thing you can do about it?
If you can't imagine it then count yourself very lucky, because this is your 'friends' reality now.
The name she so carefully picked won't be excitedly written on birthday cards and Christmas cards, she won't be writing it on invites and forms.
You are no longer the same person you were before because you have this awful, crippling, agony to deal with every single minute and your thoughts are how to make it to the next minute without having a breakdown.
You may get used to dealing with it, you might even learn how to paint a face on and smile, you can even play act at being 'normal' but the pain and sadness is always there.
Sometimes you forget, for just a second, but then reality kicks in and its like being punched in the stomach, you feel winded and the emotional pain turns to physical pain.
Now imagine after that crushing loss, your 'friends' decide that you should be over it in a few months, like your child is worth nothing, like the life you created and loved so deeply was just a little blip and you should give no more thought to it because its pissing other people off. Or that, because you find things too painful to talk about people assume you no longer care.
Your 'friend' may well have felt ok one day, or for a few days, then realised she can no longer cope. I still do this many years later. Some days she will wake up and cope perfectly well, other days she will wake up and have to remind herself to breath. That's just how it is.
Your feelings at her not being there to celebrate your happiness are nothing compared to her feelings at having to deal with her baby not being with her. Just be grateful that you have so much happiness in your life. Stop whining because not everyone is fawning over you. She will come to you if she wants to.
You may think we are being harsh, but there are a lot of posters here who are using their own experiences of losing their children to help you see where you went wrong and why this lady is reacting like this to you. Sorry you aren't hearing what you want to hear but you asked for opinions and you got them.