My two female cats (mother and daughter) had a fight :-(?

Female cats seem to be often highly aggressive towards one another. Also the stress could be caused by cats invading their territory, as female cats are usually VERY territorial. You probably need to call the animal control to remove the outdoor cats because I believe that it is probably whats causing the issue. The cats are fighting badly and injuring each other, you need to separate them to avoid high vet bills and injured in pain cats. They are frustrated and also kittens once grown up often seem to forget who their mother was and begin to compete with her over love, space, and dominance like any other random cat. Do not allow people to tease and har the cats, as this will cause them even more frustration. Give them separate food bowls and each their own litter box, then allow them contact only through cat carriers or supervision. Also in the rooms when they are separated put something the other cat sleeps on in there so that the cat will be able to smell the other one while not being able to harm it, which may help. Also give the cats lots of love an attention. Give the cats their own toys and if you see them fighting while supervising them, you may want to clap loudly and startle them. I usually do not suggest interfering with fights but they are hurting each other so you cannot let them think its ok to fight with one another. And as I said, try to find a way to get rid of the strays, they are probably causing most of the harm. Good luck and let me know how it goes!