E.M.
Sounds like my children, only mine did not act tired at 10 pm!!! My son stopped napping at 20 months. He didn't sleep through the night until i stopped trying to get him to take a nap. I just didn't see the point in spending 2 hours getting him down for a nap when he would only sleep 45 min. I will say that I believe most children need a nap, but both of my kids have always done fine on less (unfortunately). I was really worried for a long time about whether they were getting enough sleep or not (becasue Lord knows i was NOT). I finally just bit the bullet and accepted it. Since my daughter was born when my son was 25 months, i have not been able to nap with her and it has really taken a toll on my body and emotional wellness. I would reccommend at least telling your daughter to have "quiet time". If she falls asleep, great, if not, that's ok, too. At least you can have a little down time.
hope this helps.
liz