Vicky is Timmy Turner's evil, that's right, EVIL babysitter. Whenever she gets the chance to babysit, she always gets Timmy (a 10 year old kid) in trouble with his parents. Take, for example, in the episode Channel Chasers. She blames Timmy for torching his parents piano. She also lists some other things "Timmy did".
Vicky's secrets are the following:
She picks her nose and wipes the mucus in her history book.
She's scared of cows.
She lies and cheats.
And another thing, she always hurts Timmy whenever she babysits.