I'd take her to the vet, just in case. They could use the sonogram and either put your mind at ease or intervene if they needed to at that point if she's egg bound or having complications. A $100 "routine" vet trip for peace of mind would be well-worth it to me and if it's something more than that, you'd know soon enough to hopefully be able to save mom if not the rest of her eggs as well. Good luck and hope it works out for you. Keep us posted.