It’s tough. The positive about having infertility issues during Covid was that I was given an excuse not to meet up with people. In addition to the new babies, I was also able to avoid the, “are you guys going to have a baby soon?” like questions. Sometimes it was unavoidable and cry when I get home.
It is completely ok to have these feelings. You can be happy for them and sad for yourself. I think you handled the situation the best you could by letting her be happy and you take time to feel your emotions.