Don't overdo it. A simple acknowledgment of her loss is all that is needed. When my T's dad passed away last year, he did share a bit with me about the last few hours with his dad, but that was purely unsolicited on my part. I know coming back to work after my sister died, I really didn't want to get into discussions about it because I needed to stay composed for work and it was very emotional to talk about to everyone. Let your T deal with her grief with her own family and friends; let her be your T in session. If she wants to provide any details or discuss she will, but she knows what she needs to do to deal with her grief. You don't have to protect her or make her feel better. You can't, actually. If she's not ready to work, she'll take more time.