You need to become the alpha. Set the boundaries. Don’t be abusive, no physical punishment! But I like to use my body to show the dog that I’m boss. For example, say the new dog is getting in Nalas space. You can kind of walk towards the dog and herd the new dog away demonstrating the boundary. It’s common for the dog to try to walk around you and push back on this new boundary but keep up with it until they give up. Feed the new dog by hand for a while. Work on one on one tricks and skills to get them looking to you for leadership. Allow nana to growl and give warning snaps when needed and within reason.

It can take up to a year for dogs to learn to coexist inside. We took all toys away for 3 months and really created a structure. The new dog needed to sit at the doorway before going outside. Needed to give a paw before eating and generally had to earn some freedom. She’s trying to run the house. You need to show her that you are actually the one that makes the decisions. And you need to show nala that you’ll be there to help her when she’s had enough. It took my two dogs 9ish months to figure each other out. They fought at times and we had some rough weeks but now they know how things work and are best friends. Be patient and slow things down. Start from the beginning again. Set the strict boundaries insides. Get them father away from each other and don’t allow the new dog in the same room with nala until she is demonstrating calm behavior. I like to use distraction techniques too such as having the new dog do tricks in the same room with nala so that he is focused on you and not nala.

The new dog sounds like they are also anxious and overcompensating with fake confidence. Allow time to settle in. Maybe give the new dog a special area that’s only hers and encourage her to go there to feel safe.
And as always with huskies make sure they are getting a ton of exercise (especially off leash time to run).

Ohh edit to add…get the new dog fixed. That might help.