Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner. If you would still like assistance, can you tell me:
How long has she had these signs?
About how old is she?
Any outdoor access?
Any chance of an injury, fall, or slip? Any interactions with other cats where she could have been scratched or bitten?
Any lumps, sores or changes you can see around her back end?
How is she otherwise? Eating, drinking, toileting as normal?