Is it permissible for a divorced woman to recall the good days she shared with her ex-husband?

If a woman recalls her days with her husband in a way that does not lead to temptation, there is no harm in that, as in the Hadith of Umm Zar‘, where she mentioned the good companionship of Abu Zar‘ with her after their divorce. The Prophet (peace and blessings be upon him) likened himself to Abu Zar‘ for Aisha, to console her and to illustrate his good companionship.