I read this book somewhere between eight to fifteen years ago. I believe it may have been a young adult book, but cannot be certain. I do not recall the length of the book. It was definitely medieval setting, not modern. I do not recall what the cover looked like, though it might have been a closeup of a girl's face.
The protagonist was a young girl who lived in poor conditions working for someone, possibly her uncle, creating dolls or crosses. I believe she slept in a drawer or shelf in the booth where she sold her products. In particular, she made dolls near the start of the story but slowly switched to making crosses as events in town got worse.
Her products were believed to be lucky or helpful in some way, but eventually she was suspected of being a witch, forcing her to flee the town. There may have been a fire involved.