I posted a thread just like this not too long ago on the parenting forum. My ds is 4 months and I have been battling the same thing for 2 months!. He sleeps well at might but the daytime naps are few and short unless I wear him. That just doesnt work all the time. Most of the mamas told me even 4 months was too young to CIO. I'm going to chat with his pedi at his next appt in a little over a week. We'll see. Not sure what to tell you other than CIO may be too early for her age but I think it's a personal decision. GL!
Caroline-happily married to Keith since 4/27/02; momma to D (5/10/05), M (2/10/07) and S (3/25/11)