I agree that it's OK to bring up. If your T seems to be reacting emotionally, you could always stop discussing and resume in a future session. You could also talk about your fear of bringing it up because it's someone she knows, so you're worried about her reaction. That's the sort of thing that came up with ex-marriage counselor when I learned his wife was sick (and eventually passed away). The wanting to take care of him thing. Or feeling like I shouldn't discuss my reactions to things because of what they're dealing with.