Our expert says:
Sounds like she needs counselling --- what she did was nowhere near as wrong as what many others do, and the situation seems to have ended with everyone involved being happily married, and everyone has forgiven her but herself ! She may well have become Depressed, as the symptoms sound like that --- and dwelling excessively on feeling guilty inappropriately is also a typical symptom of Depression. Do all you can to persuade her to see a psychiatrist or at least a GP as soon as possible, for a proper assessment and to be able to start treatment.
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