For my two children I found that doing a longer nap from 10:30/11 to whenever they woke up (was usually 1/1:30) is best. It bridges the gap from the time when they are transitioning from two naps to one nap, but not able to stay awake til 1 yet. It does make lunchtime a little tough, but just give her a snack before nap and do a late lunch. That stage should last only a couple months anyways, so no harm done to eating habits.
In regards to the bed time let me give you some advice, which I am assuming you are looking for :) 8:30 is WAY too late for children. Some of the top sleep experts advise that from 6-8pm is the best time for children to go to bed. I know it sounds crazy, but sleep begets sleep. The more tired a child is the less sleep they will get. Have you ever noticed that children wake up around the same time no matter what time they went to bed, even if it was 10/11 at night??? I would stick with the 7/7:30 bedtime, even though it seems like it is too light to go to bed. You will be happy you did it, since as they get older (and if you have another child) it gets harder and harder to get them to bed earlier. Putting her to bed at the 6-8 time range will also help transition easier to 1 nap.
This worked with both my children and was at the suggestion of the book "Healthy Sleep Habits, Happy Baby" I highly recommend it. I call it the magic sleep book. People are always in amazement that my children will go to bed easily when I want them to and at regular hours, even on vacations or at friends/relatives houses. They willingly go to bed at 7/7:30 every night, and my little guy even ASKS to take a nap when its time. I owe it all to this book!!! :) and my perfect mommying too of course :) haha, yeah right!
Anyways, good luck and tell us how it goes!
