Well, it could cause her some internal damage if she doesn't pass it. If, by some off chance, you do see it, uh, hanging out of her behind, shall we say, DO NOT pull on it or try to help her pass it. Let her do it on her own. Years ago, a small dog of mine ate a nylon footie and my vet chose to see if she would pass it and, thankfully, she did but he warned me not to help her in any way because it could damage her internally. I'll feel better when you tell us it's in the box.