I agree with Cutter bug. You aren't the guilty party here, she is. You are entitled to have a support system. When there is visibly something wrong with you, and those close to you notice, you should let them know what is happening to you. They are there to help you. She has a support system too. Is she giving hers up?
Her actions affected you. By her thinking what she did had no effect on you. But that isn't true. Her secret is not your secret. There is one sure way to keep people from saying bad things about you. It is to refrain from the actions you would be embarrassed to have others know. Not to force complicity from everyone around you. If what she did was right, she shouldn't worry about others knowing. If what she did was wrong, then she shouldn't do it.
