If you plan on keeping her you should get her another goose. A lone goose is lonely and insecure.
She's adopting an adult mindset now, and that means attacking dogs and chickens because they make her feel unsafe. Geese attack in order to scare away to a safe distance. Geese are not really territorial, but they like to maintain personal space. They only attack when they feel they have a chance, or if they're cornered. Otherwise they'll run.
On one hand, she'll feel safer with goose company, which should lower the attack rate. On the other hand, she'll feel more confident, and that may increase the attack rate.
Grown geese attack stuff. That's just how they're made. What and how often they attack depends on the individual and on the upbringing. The best thing to do for your goose would be to get her company and to keep the chickens and the dogs away from the geese. Fence in the geese, or fence in the chickens and the dogs.