How should I comfort my sister?

My sister had an abusive husband. She has depression to begin with. He was sleeping around on her and was controlling her money so she couldn’t get her antidepressants, which didn’t help matters. Oh and she was pregnant on top of that. Because he cheated on her, she was convinced he gave her herpes. Turns out she doesn’t have them. However, she told doctors and nurses who told other people she knew. How do I help her move on despite what people think they know?
How should I comfort my sister?
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