Does anyone know of a short story, or possibly a poem, that involves a silver cockleburr? The story has a fairy tale vibe. I think the protagonist is a young woman. There's somewhere she's not supposed to go, possibly to see a witch (could be fairies, but I don't think so). She goes to the forbidden place anyway and thinks no one will find out, but when she returns everyone can tell that she went there because there's a silver cockleburr stuck to the hem of her cloak or her dress (maybe her hair). I don't think we learn what happens to her--the last line is just sort of an ominous "and on her hem/cloak/dress was the silver cockleburr."
I think I read it as a kid or early in high school, so it would have been published at least 10-20 years ago. My family owned a lot of old books that I read while growing up (though my parents have no idea what I'm talking about), so it could be an older story. I have searched several fairy tale/folklore databases with no luck, so it is probably not common/part of a canon. I also started reading adult fairy tale compilations fairly young, so it very well could have been in one of those. Not knowing is driving me nuts!