What time does she get up?
My little one has been a relatively good napper but not the best night sleeper (waking very frequently). Since reducing her sleeps in the day (which happened totally by accident) she is now going down to sleep at 7pm and waking at around 6.30am in the mornings. If she goes to bed at 8pm she wakes at 5.30am - the earlier she goes the longer she sleeps. She'll have a 1 hour nap in the morning and a half hour in the afternoon which I make sure she is awake from by 3pm. If she naps later than I know that there is no way she will be in bed at 7pm.
And looking back, when we were in the UK, because we were so busy in the day, there were days when she didn't get a nap at all and would sleep 13 hours that night - with minimal waking for feeds. I didn't really think that was ok for her but looking back she was fine.
How is she in the day time if she doesn't sleep? Not too cranky?