When I was 10, I LOVED Warriors. It's a book about regular cats, but they're "civilized" in a sense that they live and work with their clans, have knowledge about natural remedies (plants), and believe in an afterlife.
Go to a library and see what options they have ! There are millions of age appropriate books for ten year old girls ! I always used to read the Candy Apple series of books, for example Drama Queen, Totally Crushed, The Boy Next Door, The Accidental Cheerleader. They are all cute and totally appropriate.
I would suggest "The Last Apprentice" series. There are 13 books and they are each amazing and different. These I would categorize as spooky like goosebumps, but not so scary that you will have nightmares. Hope this helps. :)
Dork Diaries. It's really great if she's a girly girl. They're is a whole series to read. She'll love it! Cause I'm 10 and I've had a lot of experience with books. Also Diary of a Wimpy Kid (series) Harry Potter (series).
the Warriors series by Erin Hunter is all kinds of fun! if she is a good reader, she will enjoy it. I know I did. If she's not such a good reader, she might want to wait a year or two because the writing style is a little complicated. the plot is a little hard to follow, but that just makes it more fun to read, in my opinion.