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Thank you for using Just Answer. My name is Rebecca; I am a veterinarian. Please give me a moment to type my answer.
I am sorry to hear you are worried about Diamond. I see she is going outside and not coming home much, and that you suspect it has to do with your neighbor's 8 outdoor cats. What is your question: Do you want her to stay home more? Do you want to know why she is doing this? Are you worried this will harm her?
It is possible that she has become "friends" with your neighbors cats and is enjoying playing, or socializing with them. It is also possible she is even going into their house when the neighbor lets her cats inside. I had a cat that did this suddenly, started staying away for days and then weeks at a time.Back then I did not have access to tiny cameras, radio collars etc. Some people in this situation do put a collar on so they can track the cat, or with a camera so they can see where the cat is going.You can ask your neighbor with all the cats if they see her socializing with their cats, or if she has come into their house. If she has access to food there, that might be something that is drawing her away from your house.Let me know if I can answer anything else and how she is doing.
Thanks for the great rating.