MOMO is a real cutie pie, im glad you wont hit her anymore as well, as for the toys, lexie has salem the black cat toy off sabrina, its hers now, she loves to carry it upstairs, plonk it on our bed, kneed it, lick it, kick it,and she even hisses loudly at it, she is fond of her kitten as i call it, so its not unusal behaviour from what im told here on pet-talk although i had never experienced with a kitty before.
Im lucky lexie wont even bite when she is in play mode and you pat her, she just stops immediately,she is very loving.
MOMO is very young and will bite and scratch in play mode, just take the others advice and im sure the tone of your voice will soon let her know you mean business and to stop.