ANSWER: As an expiation for breaking an oath she should have fed 10 poor people or clothed them, if she was financially unable to do that, she should fast three days. 

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You can if you want but you should expiate for the oath that you break by feeding 10 poor people with the average food that you eat or clothe 10 poor people or free a slave. If this is not possible then fast for 3 days.

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