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

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Elske
SOLVED: Children's/YA
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SOLVED. YA Fantasy read 2004-2008ish about a young woman whose was meant to be sacrificed in a funeral fire with the dead chief/king but grandmother swapped. [s]
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There’s a young woman (virgin?) is meant to be sacrificed in a fire with a dead king/chief but her grandma sneaks her out and goes instead.
I can’t remember what happens after that, but I think it involves magic and wolves?
She’s in a castle at one point and is pregnant. Her handmaid helps her hide the pregnancy by nicking their fingertips and smearing blood on the sheets to mimic a period.
I read it with my mum when I was about 13-14 years old at my highschool library about 15 years ago, so it’s nothing recent. I never got to finish the book because I had to return it and then couldn’t remember the name.