Honestly, it might make more sense to follow her cues than to follow a particular attempt at a schedule, at least if she's like either of mine. LOL Nat hasn't napped (outside of being sick or long car rides like to grandparents) since about 19-20 months, and when she does, she's often awake till 10PM and NOTHING will induce her to go to sleep earlier.
Josie went through a LOOOONG period where she probably could have used more sleep but wouldn't nap OR sleep longer in the mornings and was a cranky kid CONSTANTLY for like a year or so - we just couldn't quite have naps OR do without them. (She also would fall asleep quite late at night with even a short nap.
) When she did nap, I tried my darnedest to make it earlier rather than later (I was even known to make lunch earlier to accomodate it) and short; eventually, we settled on Quiet Time, with her in her room reading or playing quietly, maybe with a CD going in the background; her Music Together CD's are about an hour long, and that's what I needed to regroup myself.
Sometimes she'd fall asleep mid-book or mid-puzzle with the music playing and grab a catnap, sometimes it'd be a longer nap - but I had to follow her sleep needs, also taking into account if she'd gotten up earlier or slept in that morning and how busy a morning it was.
Anyway, I'm rambling now, tired and blathering, but the long & short of it is that I'd follow her cues as best you can, and remember that most of us are winging it too!
(In other words, make sure you cut yourself lots of slack!
)