
!!! So she really is their sister/daughter?!
I kept thinking maybe she was cursed with accelerated growth.
So Mom went back in time or she was thrown back in time? And her inability to turn back into her adult version is probably her body trying to forcefully adjust to what she should be age wise in the "right" timeline?

Spoilers
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It think u got it wrong, read some spoilers and someone said that the reason fl’s mom went back in time was because her body was rejecting since she’s not originally from the fl’s dad’s timeline. fl’s Mom was slowly getting sick and since she was pregnant at that time it could jeopardize the baby’s health. she probably went back to her original timeline so that fl doesn’t die with her.
the time travel element to make her 20yr old just feels like lazy writing… going back in time to give birth to her because her powers went out of control wtf