I was thinking about it in my travels today. I thought out two ways besides yours actually:
1.) She is stripped through a series of accidents or 'unfortunate events'. This is the easier way.
2.) She is reduced to such a state where something triggers her to come clean. The others don't actually know, but in her mind she thinks they are blackmailing her. This is my preferred "psychological thriller" finish but I don't have the skill to write it.
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