The former Idol star commented on why she wants Sanchez to triumph over fellow finalist Phillip Phillips in an interview with Hollywood Life.
"I think Jessica has a great chance because she is very relatable and so ahead of her years; I try to watch her and learn some things from her," Toscano explained. "[Jessica] has the whole thing down - from the fashion to the performance to everything, I think she is a very good role model."
Toscano also expressed her belief that it's time for a woman to become the next American Idol following a series of male winners.
"A girl hasn't won in forever," she complained.
Sanchez also recently received the support of Philippine president Benigno Aquino II, who said he's rooting for the teenager.
Phillips or Sanchez will be crowned the next winner on tonight's American Idol grand finale, airing at 8/7c on Fox.
Watch Jessica Sanchez sing 'My All' below: