::: If she is a Dane or even part, be sure to raise her bowl up off the floor and also her water bowl. They can get bloat from bending over to eat or drink. :::
Resesrch has pretty much proven this isn't accurate and in fact can be very bad.
The Elevated Feeder Controversy – The Glickman Study
Contrary to previous beliefs, the study concluded that feeding dogs from elevated feeders, combined with other factors such as chest size and diets with high fat or citric acids, increased their risk for developing bloat.
greatdanecare.com › raised-dog-bowl
The Ups & Downs of Great Dane Raised Dog Bowls - Great Dane Care
Welcome group. I laugh about dogs being ruled out because the poster says not common there. We've been told our Samoyed must not be one, or certainly not a purebred because they aren't common here. But identifying by looks also gets some comical results. A dna isn't major proof, but it helps to get an idea of not only behavior, but also health issues.
Ckick to Calm"
Click to Calm is by Karen Pryor. I admire her work, but I don't agree with this one. Dogs are leash aggressive or leash reactive for many reasons. I'd rather go back to step one, teaching loose leash walking, "look at me" , down stays and other commands and training that get the dog to do what you want through positive training. Having a dog pulled around can create MORE reactivity.
You have put Nova through massive changes, plus she has massive hormone changes. It's no unusual at all for intact bitches to fight, get territorial, etc.
IMO, far better to crate for a couple of months until things settle down than have an actual fight from which their relationship may never recover. Yes, keep the crate in your room at night, but give her yummy treats, a special toy etc so she does not see it as being punished. Talk pleasantly to her, up voice "crate time" and work on being calm with her. Exercise her a lot.
When this is over, work a LOT on socialization. Biting is a quick route to being sued and dog put down. If she will bite your little sister, she is liable to seriously bite a stranger.
Work a lot on obedience... learning down/stay (I can tell Moose, our Samoyed, "timeout" from anywhere in the house and he immediately comes to lie next to me or even under my chair.), leave it, etc are critical.