I would agree, if she's happy, maybe she's getting what she needs.
I find my now 19 month old can fluctuate between an hour and 2 hours for her nap, depending on where we are or what she's been doing. I was advised that anything over an hour at this age is an ok nap. Anything less, which we do get on occasions, I move bedtime early by about 15 mins, the whole routine that is. Seems to be working so far, don't want to jinx things
I've tried to stop myself over analysing everything these days and just go with the flow a bit more.
One thing I do try to manage, if I can, is falling asleep in the car. If and when this does happen, way before nap time, then I have a right cranky pants on my hands, who either falls asleep again in the car on the journey home, too close to normal bedtime! Or one very tired toy at bedtime and I opt for a super early bedtime with a good wind down routine.
My hubby thinks I'm mental, working everything out, how little do they know about our daily troubles re sleep!! They just see a good baby, going to bed ok. They have no concept that this is mostly due to mummy's hard work all day to keep baby from getting overtired and grumpy!