For us it started at that age, but Nathan VERY quickly got overtired without the nap, and I reinstated it after about 2wks (he was falling asleep in the car within 2mins of being in there etc). Then just recently at 2.5 he started dropping it every 2-3days over the past month or two until he refused it for a week, but once again ovetired, so I've reinstated it once again in the last 2 days. It's almost like he is dropping it, but knows he's too tired without, so I let him get away with not having it for a wee while and then firm down the routine again and we get back on track.
Sorry, that's not much help to you, but just observe her and if you notice it is impacting on her behaviour, night sleep etc, definitely re work on getting the nap back.