I really feel for both of you.
I am currently pregnant after years of infertility and 5 cycles of IVF. It completely destroyed my mental health and ruined most of my relationships, the pain is so great that it is all consuming, I couldn't be happy for anyone having a baby, which actually was every woman in my family and several women at work in succession due to us all being close in age, all I could feel was jealousy and bitterness.
I distanced myself from all of these women because they were very insensitive and talked about nothing but their babies for months despite knowing how much I was hurting. Most people who have not been through infertility are very insensitive, they clearly just can't understand. You have been very kind and considerate towards her feelings which is commendable, however she is simply unable to reciprocate because of her pain unfortunately. The friendship is just imcompatible right now sadly, however hopefully if she gets her happy ending in the future you two can resume.
Now that I am pregnant I actually hate talking about my pregnancy because I'm constantly terrified of something going wrong or losing her because this baby girl is my only chance at having a family after so much heartache to concieve her, I've had miscarriage scares and lots of bleeding and I'm just terrified all of the time. People who concieved easily and had an easy low risk pregnancy with no scares can't relate to my experience and continue to say insensitive things so it has ruined a lot if the pregnancy talk/experience for me.
I also would never talk about these worries or my pregnancy mental health struggles with my friend who is still going through IVF because I know she would walk through glass for what I have and it would be insensitive to expect her to support me, so I don't talk about my pregnancy to her, we talk about everything else and I get my support elsewhere because I don't want to hurt her feelings.
So everyone saying if your friend concieved she would never stop going on about it and plaster it all over social media so just carry on talking about your baby are wrong, people who have experienced such trauma tend to be more empathetic to others than people who haven't. I'm very low key about my pregnancy because I know that people are suffering in silence and I have no idea who is hurting behind closed doors and don't want to hurt anyone.
Now that I am pregnant I have mended the relationships with the women in my family and at work as best I can, I have explained why I couldn't be a good friend/sister to them at the time and they have been incredibly understanding, but we are not as close as before, and I don't think things will ever be the same. I don't think I will ever be the same, infertility changes you on the deepest level and sadly you just have to accept things will never be the same.
What I'm trying to say is hopefully in future you two can get back to eachother but even if you do it may not be the same, and until then you just have to accept there needs to be distance between you two, for both of your sakes. Well done for being so considerate, I'm sorry you lost your friend to this awful situation and congratulations on your baby, cherish them, know how fortunate you are to have them and find the support you absoloutely deserve elsewhere because your needs are just as impirtant as your friends, but she is unable to meet yours right now and you deserve to connect with people who can.