Oh, how terrible for you and the dogs I hope they can get over this and learn to live together.

I'll tell you about 2 females living in the same house.
We had Keisha (our Rainbow Bridge Chow) and we got another Rottweiler (Harley). They all seemed to get along beautifully, and for quite a long time (about a year). Until one day, I don't know what happened but Harley attacked Keisha (she outweighed her by at least 40 lbs) and they weren't just kidding either, they were totally serious. It took both me & Mark to pry them apart, and when we did finally get them apart, guess we didn't have a good enough hold and they went at it again. Anyway, we tried all kinds of stuff to get them to "put up" with each other (cause of course we didn't want to get rid of either one), but nothing worked. Keisha could just be laying on the floor and Harley would attack her. This only happened once more and we knew this couldn't go on or my baby girl would get killed and I couldn't let that happen. We loved Harley, but she was the newcomer and couldn't come before Keisha. So anyways, we had to get rid of her, my parents took her.
I guess what I'm saying is if you try to put them together, keep a very close eye on them, you don't want one or both of them to end up seriously hurt or even dead. I hope this all works out for you. Good luck!