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

This topic is about
The Folk Keeper
SOLVED: Children's/YA
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SOLVED. YA Fantasy. Orphan girl who spends a bunch of time in the cellars of a mansion, perhaps has magical powers? moves from orphanage to massive house (in Scotland/ Ireland?). Cover: red girl, blue shadow-monsters. Read in early 2000s. Spoiler. [s]
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Sara, how far into the book do you learn her long hair allows her to see in the dark?
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Solved!
I read this book sometime in the early 2000s.
The plot was about a girl, orphaned (or so she thought) who had always had her hair cut short at the orphanage where she used to live. She goes to live in a massive house (possibly in Scotland/Ireland) and discovers its cellars. Through this she discovers her clumsiness was due to her hair being cut short, and that she can see in the dark when it's long. She finds out at the end that her mother was a kelpie/mermaid or similar mythical sea creature (if I remember correctly).
Please can anyone help? I can't remember the title or author.