A idea in the works....

heres an idea she was regressed in a successful attempt to re grow her horn by activating the mussel memory in her stump from when she still had it and it ends up working to well but for some reason she still has her scar after becoming a baby

YEAH!

That would be a fun story. I'm sure you will come up with a great way to pull it off, too. Your talent has only improved with time and a tale of a regressed Tempest / Fizzlepop would certainly be cute.

Ooh! Have her 'like' her name when she's regressed! Hearing her happily telling every pony she's 'Fizzy Twisty', or something like that, would be cute!