I feel for you and remember that phase all.to.well! DS8 rarely slept as an infant...I was so exhausted that first 2 years, I barely remember any of it. My husband was deployed for the majority of those two years as well so I can't even say it was his work schedule...my child just did not believe sleep was necessary! I even tried herbal liquid remedies suggested by herbalists to promote inner " calming ", you name it... I tried it. Some little ones just do not think sleep is important. Do you stick to a pretty regular schedule with the little one or is it really random? I know when I had DS2/3 (twins) when DS8 was 3 years old...I KNEW there would be a strict schedule if I was to survive two of them through infancy and a toddler that didn't sleep. From the day I brought them home they were schedule babies and sleep came way more natural to them...DS8 was never on a schedule so I'm not sure if thats where I went wrong.
Some kids are just exhausting in their earlier years...however there is a light at the end of the tunnel...my DS8 decided sleep was important at about 5 haha...and now even sleeps IN if he can...( now I make HIM wake up as torture back

Hopefully little one will decide that naps are important for her and mommy!