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

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The Shamer's Daughter
SOLVED: Children's/YA
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SOLVED. Teenage level fantasy book about a girl who is learning truth seeking/she can get people to tell her secrets? Or a power similar to that. [s]
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Fantasy setting, roughly medieval period. There was a girl who had the power to draw secrets out of people, possibly apprenticed to her mother who had the same sort of talent. They lived in a village and I think they provided this as a sort of trade/service?
Her estranged father was, if not a bad guy, a thief or rogue of some sort with a connection to snakes - I feel as though he had a snake ring or motif. It is possible he also had a magical ability that combined with the girl's.
I believe it was a series, and at some stage the girl had to rescue a close male friend (or maybe brother) from a castle, who may have been indoctrinated into being a child soldier for an evil duke.
I realize this is a bit scattered, but I'd be awfully glad if someone had any ideas! Thank you.