A.L.
i would start with an earlier bedtime around 7-7:30. this did help our daughter who had similar challenges with naps. also, try putting her down at the same time each day for naps. i learned to not run in when she first wakes up, and she now learned how to put herself back to sleep after that 45 min. time. this did take a few months...she's now 13 months. i know it's hard. my daughter still nurses a lot, and does so a couple times at night. we had to help her learn to fall asleep on her own and not on me since it was difficult to get anything done or a few minutes to myself.
good luck!