This reply might be a little late but I just found the post...we are going through almost the same situation. I wrote a post called 19months one nap and night waking(I think it was called). She is 21 months now and does the same thing. Can't find a schedulethat works to be consistant with. It is a nightmare to get her to sleep...she'll just play and play and play till she crashes. Please let me know if you've had any luck fixing the problem!