M.R.
My older son took naps until he was 3 1/2 and my 19 months has to have a nap if he doesn't he is one grumpy baby. He typically naps from 12-2:30 and then goes down at 7:30 until 7:30am.
I think every child is different but I do think at 22 months a child still does need a nap, she might be going through a phase.
Good Luck
M.