Krisvee - im having the exact same problem with my DD atm.... if she doesnt have a sleep during the day she is so cranky at night she wont eat her dinner properly or anything... then when she does have a day sleep she goes to sleep pretty late (around 9ish) my dd fell asleep yesterday at about 11am (she must have been so tired because that is very unlike her) and she had about an hours sleep and was fine for the rest of the day.... i find if dd falls asleep to late in the afternoon its imposible for her to fall asleep at night
so in short im not to sure what u should do lol.