Book with a picture on the cover of a girl holding a glowing green stone?

Ok. A few years back, my mom got me this book that i ended up loving. But we moved and I lost it. I can't remember the title nor the author. All i can remember is the picture on the cover is a picture of a girl holding a green glowing stone. She had a braid and there were animals surrounding her. I think... show more Ok.
A few years back, my mom got me this book that i ended up loving.
But we moved and I lost it.
I can't remember the title nor the author.
All i can remember is the picture on the cover is a picture of a girl holding a green glowing stone. She had a braid and there were animals surrounding her.
I think her name was Alexia. I'm not completly sure but i think that it started with an 'A'.
Most of this book takes place in a forest because the girl wanted to get away from her home...I think it was some kind of castle.

That's all I can remember...if anyone out there knows what book im talking about please help me.
It has a few sequels and I want to read them.
Please help!!!!
Thank you
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