R.R.
hi L.,
my suggestion is to slowly push back that morning nap until you're getting to 1 nap a day- maybe around 12.30 or 1... we did this with our now 2 year old, and we initially started with delaying it by 15 minutes at a time. however, if your little one is already staying up during her morning nap, you could try pushing it back until after lunch- albeit an early lunch, maybe!
Good luck!