Well she was Dil from Rugrats but I don't know if that counts because he's a infant lel. She was also Timmy though (also from Rugrats not Timmy Turner)
Chronologically speaking, she used her Dil voice for Timmy Turner and Poof. Timmy McNulty kind of sounds like a cross between Timmy Turner and Ben Tennyson with a lisp. I meant has she ever voiced a boy without the raspy voice she normally uses for them?