Fleur Delacour
Fleur will wake up Monday morning in the 'wrong' house and will experience brief panic upon not being able to find her husband or her baby. Within the hour, her 'real' memories will reassert themselves and she'll understand who she is and what this life is. The memories of her other life will stick around a while, coming at her in flashes of confusion as she needs to remember which is reality. Eventually the potency of it will fade, as well as most of the strong details, but she'll be left with lingering impressions.