Kizzie possessed !!!

Hi all, I only joined the site yesterday and thought i would ask for some info ref my DSH Kizzie. The last few weeks she has started hissing and growling at my 3 other cats ( 1 is her sister and 1 is her 9 month old daughter !) She has always got on well with my 2 dogs and always goes for a walk across the fields with them when my hubby walks the dogs. She is being super affectionate towards me and follows me everywhere constantly crying and also loves any attention from the dogs.
Her sister had kittens 5 weeks ago but she didn't act like this the last time she had a litter.

Any ideas ????

Because beyond the tiny kitten stage, mother cats (and kittens) stop seeing each other as 'family' and start seeing other females taking over their territory. That simple!

Are hey spayed/neutered? If they aren't, get it done ASAP - it'll take care of a LOT of the problems. Good luck!