Hi Davmid ~ It's "ok" to let your daughter try to comfort you, as long as she knows that she had NOTHING to do with your marriage breaking up. She may want to play a "motherly" figure right now, and let her -- it's okay as long as she doesn't go overboard. She still needs to be excited about doing things with her friends and stuff at school!
But kids don't like to see their parents suffering, and it's normal for them to want to comfort the suffering parent. Actually, I'd worry about a child who DIDN'T want to comfort the parent! Girls are especially the 'comforters.'

It's "inborn" in them. lol So don't take that away from her.
I'm glad you're in therapy -- you'll begin feeling better soon. Therapy helped me immensely in several situations, so don't worry. You'll be on the mend soon. God bless and take care. Hugs, Lee