Momma cat is terrorizing our older cat!

Our outside kitty that we brought in with her babies is constantly chasing and attacking our older female cat. She plays with our younger cat. I have tried separating them but we have no spare room,and our younger cat meows and digs up the carpet if we put momma in a bedroom for awhile. It's getting hectic,but I want to keep them safe! Help!

Female cats are territorial, and mama cats are even more so.  I dont know what your permanent plans are for this mama cat with babies you brought inside, but until she's gone, could you move your older female cat into your bedroom, give her a covered litter box, water dish and bed in there, and keep the door closed and the other cats out?  It IS her house, after all.  She didn't ask to be invaded by this fierce mama, and the mama cat is just doing what she naturally does.  She accepts the younger cat because it's ither young enough to not be a threat, or its male, or both.   My old cats pretty much live in my bedroom because they prefer it there.  Once the kittens are grown and gone to forever homes, and the mama cat is spayed, it should get better, but it may take some work.  For now, give the older female a break and make her queen of the bedroom.

She does spend most of the day in my daughter's room,but does not tolerate being shut in.I just now put momma and babies in our large bathroom to give everyone a break for awhile.We plan on getting momma spayed as soon as it can be done,kittens are two weeks old. And then when kittens are weaned she will be going back outside. She wants out badly but I'm not letting her out to get pregnant again! Thanks!