I went through IVF to have my son. And like everyone has said, it was really tough. There is a lot of waiting, scans, waiting, injections, waiting waiting waiting.
A lot of you have commented that the couples in your life don’t really want to talk about it, which I certainly didn’t. So I would ask how she is in general terms, but not push if she doesn’t want to talk. Often there isn’t anything to tell, you’re just waiting to see if it works, so as much as you want to know, try not to probe.
I also had a lot of well meaning but insensitive advice and anecdotes about relaxing, doing yoga, about friends of friends who were going to start IVF but then managed to conceive naturally, or people who went on holidays and just relaxed then poof! they got pregnant. All of this is meant well, but it comes across as very dismissive. Hearing about people who managed to conceive easily after doing something simple when you have been trying for years just isn’t helpful.
This probably (hopefully) goes without saying but fertility is a very private matter, and I wouldn’t share about her starting IVF with anyone unless you have her permission.
So all I would do is let her know she is loved and has support, and then let her come to you if she wants to.
Hope this helps