Some Kind of Friend — Mary Francis Shura

Jane doesn't mind being plain and shy as long as Natalie is willing to be her best friend. She finds it exciting that Natalie had magical powers that cause strange things to happen. Jane doesn't even care that the other kids want nothing to do with them…as long as Natalie stays her best friend forever.

But then Natalie moves away and Jane has no one…until a four-legged friend helps Jane unlock the shocking secret of Natalie and her power to make magic.