Hi Nichelle. I have twins and one thing that has helped over the last 2 years is schedule, schedule, schedule. My twins were napping 3x/day till about 9 months (I think) then, 2x/day till 20 months, then 1x/day still at 31 months. I plan to keep them napping (or at least "quiet time" until they go to kindergarten.
Before we tranistioned to 1x/day nap, we had two naps. The twins would wake at 7am and go back down at 9am. They usually slept for 2 hours. Then they'd go back down from 3-4pm. All in all, once they were down to two naps/day (and even after they transitioned to one nap/day) they slept 3 hours during the day (combined naps) and 10-12 hours at night. They worked their way up to 12 hours at night by 12 months old.
I hope this helps. Stick to the schedule. Babies/toddlers need those 13-15 hours/sleep per day for quiet some time. Don't give up on the naps. Leave baby in the crib during naptime. Even if she's not napping, she'll get the idea it's rest time. Mommy needs her rest too!
T.