To me it looks like petrified egg. You should be really proud of yourself... I'm guessing you had a hunch and look what happened. I think that this thread will help many people in the future. Keep up the good work!***UPDATE WITH NEW PICTURES***
I gave her a warm bath and a little while after she pooped something that look like a piece of bone, it is hard. Any idea what it could be? it's definitely not an egg
