The American Girl book series is good. Amazon has it.
It is for girls this age and for reading with Mom.
"The Care and Keeping of You" for example, is good.
Also, yah, talk with her. Why not? She is a Tween. Tweens are from ages 9-12.
And, sometimes, privacy between Mom and Daughter is good... no need 'rushing' to tell Dad. I know as a young girl, I did NOT want my Mom telling my Dad all about my periods etc., or other hygiene private things. And she respected that. But sure, my Dad was not dense, he knew and figured it out... but still, he knew it was private 'girl stuff' between my Mom and I. And IF I wanted to talk to HIM about it... he let me know, he is always there for me.... with ANY subject.
Anyhow, that is how it was, per my growing up.
good luck!