She did not observe ‘iddah following her husband’s death because she thought that ‘iddah was only required for a woman whose marriage had been consummated

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Check below answers in case you are looking for other related questions:
The ‘iddah of a woman divorced by khula’ and her going back to her husband
‘Iddah of a woman who did not know that her husband has died

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Related Answers:
It is not permissible to offer an explicit proposal of marriage to a woman who is observing ‘iddah following the death of her husband or divorce
Her husband died during her ‘iddah from her final divorce; does she have to observe the #145;iddah of one who has been widowed?
A number of questions about divorce
The ‘iddah of a woman divorced by khula’ and her going back to her husband
‘Iddah of a woman who did not know that her husband has died

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