What's the Name of That Book??? discussion

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The Sea of Tranquility
SOLVED: Children's/YA
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SOLVED. YA book about girl who is selectively mute, loves to bake, and her nickname is Sunshine. [s]
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It's a YA novel about a young girl who is selectively mute after a traumatic incident. She collects names as a hobby and used to be a great musician. After the incident she can't use her hand very well and bakes a lot of bread/pastries as a part of her physical therapy. She befriends a few people that she trusts enough to speak to and her nickname is sunshine because she's the opposite of someone with a sunshiny disposition.
I'd really appreciate anyone who does know the title and author of this book and can share it with me. Thank you!