Although I think it was definitely in poor taste to complain about her pregnancy to friends who I assume she knew struggled with IF, I would give her the benefit of the doubt. She was on BCP's and wasn't expecting a pregnancy so maybe she just wasn't thinking clearly. Perhaps there were other things going on her life/relationship where the thought of a baby was just too overwhelming. And maybe she waited so long to update you because she was embarrassed about her initial reaction. But she's your friend and you know more about her than I do. Just doing off of what you said about her I'd call it water under the bridge and reciprocate especially since she's hosted things for you.