It’s great that you and your husband fully support her. That’s the most important part of this process. You’re doing the right thing by allowing her to say how she feels and be supportive of that. Kids can be more self-aware than we give them credit for, and that could be why she’s come out to you at 11 years old.
Your concern that she might be hurt in any way is a valid one for all LGBTQ parents. Our Family Stories may be helpful – hearing from other parents going through a similar situation can be reassuring.