She is a beauty! Welcome to a wonderful home Freya. Once you get comfortable you'll enjoy your new brother.

As for the question of how often to go visit her, I'm not an expert, but I'd say as often as you'd like. You know how to tell if she is stressed out or not liking the company. Just take it easy and read her signs. IMO I would think the more often you visit the faster she'll get used to you and become more comfortable.