Ive recently been dealing with a good friend of mine who just came out.
Youve done pretty well so far. The only other thing I would add would be this--dont treat her differently. Nothing has changed between you two. She is friends with you as you are; treating her differently now that she is gay may pull that apart. The only thing different now is her choice of partners, and that doesnt affect your friendship with her. Theres nothing wrong with being gay, and she needs to know that--if you suddenly start treating her differently, it makes it feel like there is something wrong with it.
Obviously little things are going to change--you are probably going to have to be there for her more as she deals with this and how to let others know, and gay jokes might not be appropriate
But in all honesty, the best thing you can probably do for her, other than being there for her, is
be her friend. And that means treating her like you always did.