Welcome to BYC. Sorry this has happened. I tend to agree with everything Rebascora said. Reproductive disorders such salpingitis with lash eggs, and internal laying are very common in todays laying hens.
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I would go for where it's attached to the chunk,so you don't accidentally clip vent then examine the chunk and let us know what you find or take pictures.
I would go for where it's attached to the chunk,so you don't accidentally clip vent then examine the chunk and let us know what you find or take pictures.
In the second photo, it looked like the large blob was no longer attached but from what you say I'm wrong, so I would leave it attached and see if you can gently ease out whatever it is attached to by bathing and lubricating and gently applying some pressure by pulling it. My bet would be that the "string" is an egg membrane and it is possibly part of a lash egg and the rest is stuck inside.
The outlet from the gizzard is much smaller than the vent, so if it was something she ate, it would have stuck in the gizzard and not even made it into the intestines let alone the vent, so the most likely conclusion is that it has come from her oviduct, which points to it being a "lash egg". You really do need to help her pass whatever it is attached to because otherwise it will prevent her from pooping and that will kill her within a few days..... so try not to be too frightened as she may well die if you do nothing.
Like others, I can assure you that that thing is not going to bleed if you cut it open, but if it is still attached, I would try to use it to draw whatever else is in there, out rather than cut it off. A nice warm Epsom salts bath in dim light should help her to relax a little, which may help her to pass the rest with your help. Good luck and keep us posted and a photo of that thing cut in half when you get it all out.
..... shoved what in where? Did you give her a nice long soak in a warm Epsom salts bath?... a couple of teaspns of salts to a gallon of warm water. This will help her to relax which may help her to pass the rest of that mass that you can feel inside. Gently massaging her abdomen whilst she is soaking may also help and possibly giving her a half a calcium tablet crushed and sprinkled on some soggy bread or scrambled egg. Calcium will help her muscles to contract to push that mass out. If she doesn't manage to expel it, it may well prevent her from pooping and she will die of toxic build up within a day or two.So I shoved the rest in there.