Rabbit may have eaten metal hook?!?

HELP! My rabbit may have eaten metal Yesterday when I came to check on My rabbit her hayball that hangs on by a “hook” and chain was on the floor. I can’t find the hook anywhere and in terriefied she’s eaten it! I cleaned her up and threw away all the hay but I can’t find the little hook. It’s around an inch long and I’m afraid she’s eaten it!