I think my DD is moving to one nap, but I'm struggling to work out how to manage this without her getting horrifically tired late morning. She is still totally ready for her morning nap about 3.5hrs after she wakes, but then completely resists the afternoon nap (today she'll have been awake from 10.45am until bedtime!).
So what does your day look like if you've just moved to one nap? Also, DD wakes super early (around 5am), she'll sometimes doze in my bed with me for a bit but the early waking means a long stretch to lunchtime.