How long is she awake for when you try to put her down? Does she appear tired?
We having few probs at this stage where she only wants one nap but sometimes its a long time til bedtime.

Our routine roughly is:
Early morning breastfeed then back to sleep.
Up anywhere between 7-7:45
Breakfast bout 8- 8:30
breastfeed 11ish
put down for nap bout 11:15- 11:30 ish
Lunch when she wakes from nap
arvo tea bout 3-3:30ish (breastfeed or bottle plus yoghurt)
dinner 5:30
bedtime routine 7ish the breastfeed and bed.

In the day her nap can vary from anything from 45mins to 2 hours. Depend what mood she's in.