Thank you for replying so quick!!!
I went to get a photo but her fat is concealing it now, she had puffed up defensively and now it's like she has two deflated bags on either side, the water is supporting her a little, it's odd.. my camera couldn't capture it, she's stepped back into the water, breathing okay..

Could an impaction be that sharp? I thought it was a rib before I found out they don't have any, but it did seem to shift like a poo

I can't believe I'm hoping for impaction..that I can treat..