babyre - I think you definately have to watch her. I think a few days of early everything then try to slowly go back to your normal (or in her case a wee bit less then average) A times. I also think if things go wonky once back on your normal routine, you can always go to an early bedtime for THAT night to catch up. I think its most important to watch her because just as you suspect, she coul dbe getting to the other side now and being undertired for naps. It sure is a guessing game isn't it? Just make sure, whenever you move times, you go slowly, if you just jump back to what everything was, I would be afraid of her getting overtired again. Also, be sure to fix what made her ovetired to begin with.
I wouldn't leave her to cry alone for any length of time honestly, there is a better way - stand by her crib so she knows she isn't alone, you dont have to touch her or talk to her to let her know your there. My gut says for those naps, she wasn't sleepy enough when you placed her in the crib.
Good luck, I hope that helps!
Zoey