beta
FL's previous life happened in that world and timeline. Not only that: her parents are literally her previous life's companions (they know who she is since the beginning)
Not regression, but she turns into a child due to a curse and later regains her adult form
FL is always a child before and after, but travels back in time to a timeline where her dad is younger and she hasn't been conceived yet
ML travels back in time
FL reincarnated into a child's body but her previous life (as the black dragon/disaster sealed by the hero) happened in that world and timeline and her dragon body still exists. Her father is literally the hero that sealed her
FL is only temporarily trapped in a child body, but eventually regains her adult form
FL's previous life happened in that world and timeline: her current dad is the duke to whom she (the queen) passed down the throne to before her death
Although she's in a different body, she actually time travelled instead of regressing. Her other self still exists in that timeline
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FL and her future self switch places back and forth, so she basically time travels both to the future and the past at the same time while retaining her younger/older body
I Don’t Want This Reincarnation
(novel only)
ML transmigrates into a new body but has an ability that makes him switch to his older body when he uses it
Reincarnated and Spoiled by My Arch-Enemy