Well, her reaction could vary a great deal. If she's not very familiar with the concept or has some pre - conceived notions, she might be a bit confused or even taken aback. However, if she's educated and progressive, she could respond with warmth and support, saying something like 'That doesn't change how I see you as a friend'. In the best - case scenario, she might become an ally in your life, standing up for you when others might not be so accepting.
Her reaction could be one of shock initially. But then, it depends on her personality and beliefs. If she believes in equality and acceptance, she'll probably start to ask questions to understand you better. She could say things like 'Tell me more about what this means for you' and show a genuine interest in your experience. On the other hand, if she has some old - fashioned ideas, she might distance herself, but that's not the kind of friend you really need.