Thanks for the chapter!
Oh dear, so the original Elena must have regressed then from maybe the same timeline the prince experienced?
I'm still wondering what happened to her and how she did that (regress and then soul-yeet herself out of there)
The powah of wishes. Klaus said that Elena's wishes destroyed the previous timeline, so it wouldn't be weird if it's also her wish that made Klaus and Larriett regress like her. Maybe she wished to return to good-old-times. For soul-yeet, it's because she wished to disappear.