Many thanks to all here for your concern and insights.
Let me begin this by saying this is not my cat, and that the person who’s cat it is overfeeds her – to the point where she was misdiagnosed as pregnant by several knowledgeable cat people.
The answer to this mystery was:
Fat.
Took...
Note this looks rather like a fly larva. It's not a section of a worm - it's a complete animal. It moved through the fur of the cat, and it moved around on the paper as I've seen larva move in dead animals. I assume it came out her anus - she's not cut nor does she have any infected open wound...
Small white thick round worms.
2 y 2 year old female outdoor cat. Vomiting and licking around hindquarters. Found two small white thick round worms around vagina. Took a picture but see no way to post. Worms were not segments –...