I'm glad I read this properly I thought she had eaten another rabbit's, called Furbie, ear!
Millie has also swallowed TV remote buttons and had no tummy issues. Like Snowberry says just make sure she is still eating and popping. I'm sure it won't stop her trying to eat more things she shouldn't! :lol:
ETA: Pooping not popping! I would worry if she was popping!