DS is 15 1/2 months and went from 2 to 1 nap around the 1 yo mark. It took about 6 weeks for him to totally drop it, as some days he'd have a short first nap and would need/want a second nap. Then it was just an afternoon 'rest' in his cot, then nothing (he'll have some 'quiet time' on his little lounge if he's tired in the late arvo). I found once he slept past midday, if he had a second nap he'd be wide awake at bedtime still (7:15pm). I also found if he slept past about 4:15 that he'd be awake at bedtime, even if the arvo nap was only 10-15 mins. Now he wakes up around 7:15am, 'little lunch' around 10:15am, nap time from 11ish until 1:30ish (yep, he LOVES his sleep!), 'lunch' just before 2pm, dinner at 6pm then bath, milk, story and bed at 7:15pm. I think dropping her arvo nap might be just the thing. Be prepared for some afternoon quiet time if she's really tired, but otherwise stick to her normal routine. I'd say that her giving you a rough time is her way of saying she's ready to drop it (that's what DS did anyway, and as soon as I stopped being stressed and worried that my great sleeper was gone and just got him up if he didn't want to sleep, he was back to his usual great sleeping self ) HTH