Hi Lana
I found with DD that from about 9-10months i cut out 1 day sleep.
So now she has only 1 sleep during the day and she is in bed by 7pm and sleeps solidly for 12 hours. I found only letting her have 1 sleep in daytime made a big difference to her nighttime sleep.
Yes she at times is grumpy towards the late afternoon but i would rather that than a bads night sleep.

In saying that everynow and then she will wake a number of time through the night - either nightmares, cant find dummy, sick, loud noises etc but for the most part - a good sleeper.

Do you have much of a routine for bedtime at night. We have a strict routine of :
Dad comes home, play outside, have dinner, bath, milk and bed.
It has worked wonders for us since we introduced it so she knew it was night time sleep and not day time naps.

Also we keep the room dark. No nightlight so if she wakes she cant see anyone or anything and goes back to sleep