x2...in my experience, also, ganders have typically been the most affectionate. They tend to stay sweet for longer than the females, too. I think ganders are seriously underrated.
Agree with @Goosebaby - a big personality doesn't necessarily translate to "aggression" later. She sounds healthy, active, and vibrant, which is a great start for a gosling.
Personally, I wouldn't worry too much about her assertive personality at this point. If you can get them out (safely...