Growing to Love a Love Story

My daughter is nine and very much not in the "boys are cute" stage yet. Which I'm totally fine with. She thinks they're good friends and sometimes funny, but she doesn't want a boyfriend. Honestly, until this year, she didn't really want to read any books with that stuff in it either.
But, in the last year or so, she's read a few of my favorite stories, like Anne of Green Gables (and most of the rest of the series) because she absolutely loved Anne and wanted to know when she was going to marry Gilbert. And, as we've been reading through the Laura Ingalls Wilder books, she's watched Laura be courted by Almanzo. And y'all, the giggles!

She's starting to like the idea of a love story and a romance. Does that mean I want her to go out and read any and every love story out there. Good gracious, no! But to ease into it with stories like these, where the relationship is built on something more than looks or physical. Where the characters form a bond over shared experiences and trials and memories. Where the marriage has a chance of surviving long-term. Those are the romances perfect for a young girl just dipping her toes in the water of love.
I'm hoping these books and others like them will give her an idea of what to look for in a good guy. That she'll see from not only the stories but also her parents' relationship that romance isn't supposed to be all kisses and butterflies, but that it can also be a friendship turned more. 
But mostly, right now, I'm enjoying her giggles every time we read about Almanzo coming to pick up Laura to go for a buggy ride or to attend a singing. My daughter knows what's coming and she's itching to get to where they're actually married finally, after reading about them for so many years. But until we get to that chapter, let the giggles live on!
What stories did you start your children out on to help them ease into the idea of romance? Any other good ones I should be looking for?