back in february, my bf decided to foster his sisters 2 yr old cat named Darlene. she is spayed, and she is a friendly cuddly kitty. before i moved in with my bf in march, he had my oldest cat Kitty with him until i moved in with my 2 other cats who hadnt been introduced to Kitty yet. well kitty,oreo, and Darlene get along well. and my other cats morris and oreo get along well with kitty. but around april, darlene decided to start picking fights with my unfixed male, morris. she also started to literally leave piles of poo and puddles of pee everywhere BUT the litter box. ive tried crating her and she sprays bad like how a male cat would and it is the worst smell. i even tried locking her in the bathroom where both litter boxes are, one uncovered becuz 2 of my 3 cats wont use a covered one, and a covered one which is my bfs sisters. and even with completely clean litter boxes, she would leave dozens of puddles and piles all over. she hasnt used a litter box since april. many times she went into my bedroom and pooped all over my clothes i had on closet shelves and armoire. my bf and i keep her out pretty much full time unless she wants in to eat and get water. if we dont,we end up with our furniture, tables, stove, sink, dish cabinet, shelves, tv, pretty much everywhere full of poo and pee puddles. she has also chewed up and shredded clothes and we have had to replace furniture and rugs becuz it was so bad that it ruined them. she has been with us long enuff that she is trying to take over and dominate my cats. and i am worried about this situation becuz my cat Kitty is about to have kittens. morris is the father and hes been so loving to kitty. i know my cats wont be a problem, but i cant handle having a cat around that is acting like darlene is.i am breaking up fights between her and morris almost daily. he tries to get away and she picks at him and beats up on him causing my other cats to defend him. i know shes doing this becuz she misses her owner. and its probably also a dominance things. i give her the same amount of love, attention, and care as i do mine. but nothing seems to work. and its starting to get cold where i live and i would feel awful having her outside. for a month after i caught darlene making messes, right in front of me knowing i was watching her, my bf kept saying that female cats dont spray and he was blaming my poor morris who has never sprayed until he kept catching her in the act. darlene has wooped up on my morris so bad that a few times he lost control of his bladder. when she is outside, she roams and goes around trying to beat up neighbors small dogs and eating their dog food. she is acting very territorial to everything but people. what can i do about this?