Ok, I read this book when I was a child, about 13 years ago.

It was about a girl whose name was Kate. She traveled back in time and ended up in a family. She was identical in every way to the Kate from their family except she talked funny, could read and write, etc.

She convinces the brother and maybe a sister or her mother that she's from the future, teaches them to read, falls in love with the boy and has to decide to go back to her own family.

I do not believe that this was a Caroline B. Cooney book. I really am certain that the heroine was Kate, not Annie.

I don't know the name. I know I saved the book, but can't find it anywhere!

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The other book was called Five Were Missing about kids kidnapped and trapped in a cabin and how they escaped.

Anyone know either of these books?