My rooster did the same thing when he was 6 months old (my little girl had left her hairband, which was also a solid, fabric one, without a metal connector) in the yard, and he devoured it. It took a while before it went down, and I chased him through the yard, trying to take it from him (no success...).
Well, he's still around 7 months later, so I think your hen will be fine
Well, he's still around 7 months later, so I think your hen will be fine