My 48-year-old daughter tells the same story/event over and over, sometimes on the same day. What should I do?

There is a condition called pseudo-dementia, sometimes spelled pseudodementia. This condition is caused by some depressive disorders.

Did your daughter go off her anti-depressants by slowly weaning herself off under a Drs supervision or did she decide to stop taking them one day?

Also have your daughter checked for an Urinary Tract Infection as that sometimes can mimic dementia.

I don't want to be alarmist, but your daughter is not quite too young for certain types of dementia.

But all the same, I would guess that the withdrawal of antidepressants - especially if she'd been taking them long term - has more to do with it. Would you say the repetitions are improving, or getting worse? Perhaps best just to keep a close eye on your daughter and speak up to her and/or her doctor if you're still worried in a month or two, or if things get worse.