You want to know about feline leukemia symptoms? Fever, vomiting, diarrhea, anemia, breathing problems, weight loss, reproductive failure ... The signs are variable, and the disease is very serious.
Be aware that this disease is contagious.
It is spread through saliva, feces, urine and sometimes also milk. The virus doesnt survive for long outside the body, but still you should be aware of the dangers if you have a multi-cat household.
If you have two cats and one is ill, give the healthy cat a separate litter box or even better, an automatic litter box. Also, keep your ill cat isolated.
However, not all infected felines get ill. But:
Once your cat gets leukemia symptoms, it is almost always fatal.
There are no drugs or vaccine to fight this virus. Some medicines may produce a remission of feline leukemia symptoms, but this is only temporary. Since treatment is not possible, euthanasia is often the only solution.
This is from
http://www.cat-pregnancy-report.com/feline-leukemia-symptoms.html.
ETA: Does she have any other cats? If so, make sure that you get them vaccinated for Felina Leukemia. I hope that the kitty doesnt have it. Let me know how the test results go.