hi S.! I see you already got lots of responses but can't resist chiming in. I agree that you have to find what works for you & your little one, and following HER lead for a routine at this age is perfect. I enjoyed the Baby Whisperer books by Tracy Hogg. I think a routine is very useful and benefits Mom & baby. I saw another post recommended the Weisbluth book - I would absolutely advise against that book (it's all about crying it out).
Anyway, at that age my little one took THREE naps per day, and then went to bed around 8 or 9ish. Below's what I wrote in her journal from then - good luck:
"She tends to go through several 3 hour cycles per day of eating, activity and sleeping. For example:
7:30 eat (just nurse)
9:10 eat (2 tbsp oatmeal & 2 tbsp milk, 1 tbsp pears)
sometime between 9:20 – 10:30 nap for 1.5 hrs
12:10 eat (2 tbsp squash, 2 tbsp carrots, __ oz bottle)
12:30 nap (1.5 hrs or so))
3:10 eat (2 tbsp sweet peas, 2 tbsp sweet potatoes, __ oz bottle)
4:00 nap (1.5 hrs or so)
Napping:
If she’s been up for more than 1.5 - 2.0 hrs and is cranky she is probably in need of a nap. It’s easier to get her to sleep if you get her to lay down before she gets too cranky –watch for yawns or rubbing her eyes. "