Richa, I would still go for 12 hour days, don't wait for cues. If she's awake at 8am, do a 1.5 nap and get her back in bed with lights out by 8pm.
Huby, the clue for us was that it started taking Stan a really REALLY long time (like, over an hour) to fall asleep at night. He wasn't crying or unhappy, just couldn't get to sleep.