1yr and 2 month female dobermann, luna

This is a very difficult decision for our family, but we have 2 girl dobermanns and they have recently started fighting the last one resulting in vets trips.
Luna is a very loving and loyal girl but she's not without her faults she needs more socialising with other dogs but is a quick learner. Luna doesnt like to be left for long peroids on her own she is House trained, she is a excitable girl. She lives with 5 cats.
She is microchipped, upto date with jabs, flea and worm treatment.
My girl will only go to a 10* home so please don't be offended if I feel you can't provide this. Although is it difficult keeping 2 dogs apart i am in no hurry to pass her on to anyone. Thankyou