Just before Darcy turned 2 she started to fight it as well, but I think it was just part of the testing the boundaries phase for her.
At daycare they still have to have a 'rest', and that suits me just fine. Like your bub Darcy falls asleep about 4-5 if she doesn't have one, so that tells me she still needs one. However if she doesn't go down early enough then we don't go to bed until late - so it's catch 22.
Good luck, I hope you figure out what she needs.