my two Huskies are separated by that same reason... Ninja can´t stand China.... they share a gate and can sniff/see each other but not touch...

China wants to play and Ninja immediately growls and snaps... so for their better they are separated... no big deal... I´d love if they could be together but it just wasn´t meant for them... both were raised together since puppies... but a third dog started this between them... so it wasn´t abuse or socialization just maybe following up or dominancy... China is very very mellow and Ninja is more dominant but was ok until this other dog tried to be the alpha on China... when removed Ninja took over that task and it was not pretty...

I hope her being young might still be able to "remove" the ugly part so they can be together...perhaps more time for her to realize not all people and not all dogs are bad... she might not know that dogs play...