A genre she may like to try would be "Gothic Romance" from the 1940's through the early 1970's. You'll have to find them online (search the term on Ebay) or at a used book dealer.
Don't let the term, "Gothic" fool you. It's not about vampires, it's more soft thriller, than anything; with a strong dose of mystery, usually. The romance part is also not highly sexual. Mostly, I'd say the genre concentrates on a so-called "damsel in distress".
I've been a fan of these for years and have yet to find one that has any descriptive sexuality. Or cussing or goriness. Think along the lines of Perry Mason and Della Street meeting for the first time and Della falls in love with Perry only to discover his family has a strange secret....one that may be her undoing!
If I had a seven year old daughter who could read at a low high school level, I'd be comfortable with these for her.
