Just be cause she doesn't seem to have a problem being out to everyone doesn't mean she doesn't or didn't. It is important to keep in mind there could have been struggles you are completely unaware of. And, if perhaps there were not, that only means that your situation is slightly different. Coming out like this is your choice, but pre-framing an interaction can help a final push for you to reveal what is hard. This kind of strategy has at least helped me make a hard admission in the past.
What I mean is to try to schedule a 'conversation.' Let her know that it is a serious subject matter, but be sure to clarify it is not a negative subject. It is something you want to discuss, and you would appreciate her time and attention.
You want to navigate to the actual instance itself, then there will be a three dot options menu on the top right to block community. I do this plenty for nsfw instances.