K.J.
My son went to one nap shortly before 12 months out of necessity (had to pick up his older brother from preschool at nap time) and it actually worked out better. He always went down easily because he was tired, slept 2 - 3 hrs. and was ready for bed at 7:30pm. She's likely ready. Give it a try. If it doesn't work, you could always go back. She may be at that in between stage where some days she'll take 2 and some days she'll take 1. Good luck :o)