What do you say to someone after a miscarriage?

Hey ladies, so my brother in law’s wife suffered a miscarriage a couple days ago. When my husband told me, I was shocked and felt so sad for her. I have never had a miscarriage and can’t even imagine what she is going through. For anyone who has had a miscarriage before, what do you wish people would have said to you? I have seen a lot of posts with women saying what not to say when someone miscarries but what should you say? I don’t want to say anything that comes off even a bit insensitive, and I don’t know if it’s too soon to send a text and let her know that I’m here for her. Thanks!