Sally, all you can do is let her know you're there if and when she needs to talk. I suspect she will eventually come to you.
Plus, it's hard to hear things you can do absolutely nothing to change or stop. It just adds anxiety and stress to your life. And I know you just want to help your daughter. That's normal and natural.
How many times do we actually do the same thing when we tell our kids we're doing fine when we really would love some help.....but we don't want to worry them. I'm guilty of that!