The best thing to do, is have the dogs met on neutral ground and see how they interact. What is the girl's temperament and situation.
when we added Banks, she was 11 weeks and Nitschke was just a year.... When we added Cheli after Nitshcke past, Banks was 6 and Cheli 8 months. we did a full week of intro/interaction, before we brought him into our home. However, Banks is very dominate, so we had to work on her reaction and acceptance of him. Now, almost 3 yrslater, they balance each other out and now between themselves when to leave the other alone.
going to tag a couple members to give advice too