I adopted a female kitten that is about 8 weeks old with 3 other litter mates. She is a medium-haired tuxedo. I've had them for about 3 weeks. I brought home a new toy for her to play with today. It's a stick toy with a feather and a small stuffed ball attached (no catnip.) She loves it -- so much so that she growls and hisses while biting and kicking it.
She drags it off to another corner and continues this behavior by herself for a long time (20 minutes until I interrupted.) It seems obsessive because she is oblivious to any outside stimuli. She shares all other toys with her brothers/sisters and does not hiss at them while playing. She does not react to cat nip yet. She only hisses when I include this toy in their group-play.
It happened immediately, the first time I unwrapped the toy and continued until I put it away. She seemed fine afterward, playing with her sister, not drugged or dazed, but she did search for the toy for a few seconds, once or twice.
The others do not react the same way but they did not participate while she played with this toy, seeming to read her ques immediately. They played with it unenthusiastically when I continued to tease the group with it. This is when she hissed, then carried it off again and continued rolling around and growling.
She has hissed and growled once before when her sister and brother came back home after spending a week with someone else. She was fine again after 24 hours -- sleeping with them and grooming them again. She is normal and friendly otherwise.
What is this reaction? Is it healthy? Should I get rid of the toy? I am concerned she may have problems with other cats in the future and I really want more cats. Is this a red flag or some behavior issue?