
Having had the misfortune to have had 4 blocks with the Flatties I have to agree it sounds like this. Is she toileting OK at the other end, not that this is always affected? Problem is the sponge, or whatever else she has eaten, may not show on x-ray and only by the Vet opening her up will the truth out. One of mine had swallowed the outer casing of a soft ball and it had lain in his stomach without any problem for some time until he ate some rotten fish causing him to vomit and it was dislodged. Only once it moved did it cause a problem and on opening up, as nothing really showed on xray did the Vets discover that it was starting to rot his intestine and we were lucky he had moved it when he did.
I am now paranoid if they throw up wondering if they have eaten something they shouldn't have!!
Hope she gets better soon.