She was a young girl who was tortured and murdered by the woman who was supposed to be watching her (as well as one of her sons and a couple neighborhood boys).
There is a (fiction) book "The Girl Next Door" by
Jack Ketchum that is loosely based on the case.
So
Sylvia herself wasn't a bad person, but it's tied to a horrible crime.
If you wanted to read about it, here's the wikipedia page:
https://en.wikipedia.org/wiki/Murder_of_Sylvia_Likens
Isadora Evander Larkin
Radiance Nocturne Grey
www.behindthename.com/pnl/59411