I cannot see the spot clearly enough to have an idea of what it might be. If she has a swollen belly and isn't eating then it sounds like ascites which could be from a cancer or other reproductive problem. Those usually end up being terminal, but how long she has is pretty variable, depending on exactly the cause. The fluid is usually from a liver that is leaking fluid into the abdomen, and causes are varied. If she's not feeling well, then others may be picking on her, and she may have been pecked in the eye. If you have some terramycin or plain neosporin you can use a bit of that in the eye a couple of times a day. If you can get better pictures of the eye it might help.