Dog-aggression of any sort does not translate to human aggression, though humans can be injured separating fighting dogs, and there is redirected aggression. An example of re-directed aggression could be when a dog is actively fence fighting with his arch-enemy, and totally in a zone, and someone goes up to him and takes the collar and pulls him away from the other dog, if the dog were to bite or snap at the person in this situation that would be re-directed aggression.
The dog would already have to be totally engulfed in his aggression toward another bitch, to have this happen.
Furthermore, bitch-bitch inter-pack aggression doesn't seem to translate at all to bitches outside the dog's pack.
What this means, is that no, I don't think you have a problem at all, if you have already found a home for the other bitch. I would definitely not bring in another bitch into your home. A dog-pup, is a maybe. I probably wouldn't bring in an adult dog because then you have two dogs with possible baggage, that may not get along. The chances are much better that your bitch will get along with a puppy (male or female), but after the pup becomes sexually mature, she will probably start WWIII with the young bitch. This probably would not happen with a male pup, but it is hard to be 100% certain on that. I mean, some dogs may suffer from SSA, and other forms of dog aggression at the same time.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC