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Not sure what happened there. See below for Wiki extract (hope it works this time)
He saw his role as helping her survive the stress of the job, which he urged her to resign on the 10th anniversary of her becoming Prime Minister, in 1989, sensing that otherwise she would be forced out (as happened a year later). After his wife's third election victory in 1987, whilst watching his wife wave to the cheering crowds outside Downing Street, Thatcher said quietly to his daughter Carol, "In a year's time she will be so unpopular you won't believe it". In fact, this happened 12–18 months later than he predicted.