Malia's reaction seems normal, though the key to a good introduction means being able to see and smell each other on you and on them by way of a barrier and mutual time spent with both close together, separated by the barrier of course instead of isolation in different rooms.
That's how I view introductions, at any rate. Without a barrier you can see, smell through made of lattice, the visiting kitten is going to be viewed as an intrusion rather than co-habitation. I think complete separation by door might as well be called isolation unless you are frequently trafficking in and out multiple times an hour.
I might be alone in thinking this but I'm doing it out loud as a counterpoint. Dominance is not a bad thing. You do it when they misbehave, they do it for more animal hierarchy instincts.
If you are introducing dogs to cats and vice versa, unless you have a larger cat then dog, you lay the dog prostrate and allow the cat to interact or vice versa. Give praise for good behavior, talk to them and help them become accepting.
If you keep pulling Malia off of the smaller kitten, then she is not going to feel satisfied she has established dominance. In other words, sometimes you need to let the hierarchy form unhindered and nature take its course. If there's going to be more than hissing, then you need to pay very close heed. Dominance can go two ways - fighting or acceptance. When you have a hierarchy, someone is always on the bottom.
Rose is going to hiss, she's going to growl, she's going to wiggle, and she's going to be unhappy. Now if it's flat out claws flying and biting then it's not expressing dominance but it's straight hostility and you have to proceed with introductions more slowly. Get those face rubs and licks going big time on one hand from Rose and rub Malia's neck, chin, and face. They need that scent of you and Rose mixed in.
There is also play dominance, the very encouraging kind, when cats completely accept one another while they are wrestling. My alpha Anubis allows my SV kitten Isis play dominate him and she bites down hard on his neck, wiggling or tugging skin flap with force that would make me uncomfortable. Right now, he's in charge. When she gets older, two things will happen. She will be in charge or let him keep thinking he is. (humor)
tl:dr - First change the 'stage', observe, wait for the time they can come nose-to-nose and not immediately growl or hiss. Or, one kitten reaches out to make contact through the gate. You know that kitten is ready for close introduction. Keep luring Malia close to the gate and let Rose touch her through it.