Basic Sleep Guidlines

My question: Should my almost three-year-old still be napping? She isn't, and hasn't for about three months. We're in a bad way around here. The chart tells me she needs more sleep overall, but should I try to add the nap back in or just put her to bed earlier at night? Or both?

Age	Nighttime Sleep	Daytime Sleep *	Total Sleep
1 month	8 1/2	7 (3)	15 1/2
3 months	10	5 (3)	15
6 months	11	3 1/4 (2)	14 1/4
9 months	11	3 (2)	14
12 months	11 1/4	2 1/2 (2)	13 3/4
18 months	11 1/4	2 1/4 (1)	13 1/2
2 years	11	2 (1)	13
3 years	10 1/2	1 1/2 (1)	12
* number of naps in parentheses

(Chart from babycenter.com)