On the assumption that (3, 4, 3) is correct, "She Loves You" wouldn't fit anyway. The only Beatles song I can think of which fits that pattern is "Cry Baby Cry".
Thanks Mark 3,4,3 is correct the clue suggests that it is she love's you but as you say letters are wrong .and yes the only song that seems to fit this amount of letters is cry Baby Cry but that doesn't fit with the clue!!