christie, I can't help you with Hannah Swensen and Key Lime Pie is not on the menu anywhere in the UK, but surely a quick flick through one of the books should give you the feel of the content? Are you worried that they may contain lots of sex and violence?
Below is an article from our daily paper about the children's author, Philip Pullman and his dislike of labeling books according to age.

Here is a link that might be useful: Age-banding of books.

I've read a few of them and found them pretty simple--probably about right for a ten-year-old. I can't remember any lurid scenes, but it does seem she has a beau or two. You might flip through to check, but all I remember is the cold MN weather.

Christie, I agree with carolyn_ky. I have read a number of the books. Started reading them cuz I'm originally from MN. They are what I think could be called cozy mysteries. No lurid scenes, no reference to having sex, or bad language that I can recall. With the boyfriends, she just kind of compares the two in her mind. One is very good looking but kind of a chauvinist, though he does care about her. The other not so good looking, but a very nice man, treats her well.
Bottom line, if I had a 10 year old daughter that wanted to read them, I wouldn't have a problem with it.

Carol

They are definitely not written for children, much as the covers may make you think that-the covers are done by a Japanese artist in the "comic bookish" style.
I have read all of them. There is the occasional reference to boyfriends and the occasional "knee-melting" kiss, to her widowed mother having a beau with the overtone of how close were they...??? and to her college aged sister dating a policeman-but besides the fact that they are murder mysteries and, thus, will occasionally describe with some detail a murder scene, I wouldn't have minded if my daughter had read them at 10. She read The Giver at 10, and that subject matter is darker than these.

However, I do see the requests for homemade cookies increasing markedly at your house.

Thank you so much. There are several so that will keep her busy for awhile this summer while school's out and you're right, she's wanting to bake. My kids seem to show much more interest in reading when they get going on a series of some sort then when they read them all, they start watching tv again so I'm always glad when they find a series they like.

Christie, there are quite a few of these type of 'mystery with recipe' authors. Usually they are in the 'cosy' genre and quite innocuous. The only thing that grates on me is when the recipe is starred, with a footnote 'See page vii' which yanks me out of the story into reality!
Enjoy the baked goods!

Annpan, the only recipe I ever tried was Killer Brownies from one of the Goldy Baer books, and they were dry as dust!

I have tried a couple of the cookie recipes from the Fluke series-they were good.