I don't think it's unheard of to have a 13.5 month old have 1 nap. I work at a mother's day out and our rounting for our 15-18 mo olds was one nap, so that's not too far off the mark. I know we did lunch around 11 so we could have them down by 11:30-12 b/c they ARE tired. What time is she taking her morning nap? If it's at 10, and she's playing for 2 hours, maybe that's the thing to do, let her play until 11 and then feed her and put her to bed. If her morning nap is earlier, you can always do a good snack 30 minutes before bed, then nap, and when we wakes up after lunch, give her another good snack. Like if you were going to feed her goldfish, yogurt, and meat for lunch, maybe give her the meat or yogurt before nap and then give her the goldfish and whatever is left when she wakes up.