that's one of the most painful things about these situations - our children feel like they have to protect us, or do something to make it stop.
It's really important to keep doing what you're doing. Let her know repeatedly that she has no responsibility here and if she wants to do something, the best thing she can do is keep being honest with you both about her feelings.
M 20+ T25+ S ~15.5 (BD) BD 4/6/15 D 12/23/16
"Someone I loved once gave me A box full of darkness. It took me years to understand, That this too, was a gift." ~ Mary Oliver