bless your heart, I know how frustrating 45 min naps can be!!! DD did them for a number of months, but for us going to a 4 hour easy fixed it. I think ours had a lot more to do with she didn't have enough A time! But I know it doesn't always fix it - going to more A time. Some babies it is just biological, and there isn't much you can do but let them grow out of it. Frustrating because 45 min isn't enough time to do much of anything productive, including take a shower, and get ready to go somewhere!! DD was a great self soother, but no matter what I tried she would NOT go back to sleep after waking from a nap until after the next feed cycle. I hope you can find more answers, and if nothing else, I hope you can find the right A time for her so she has at least a 45 min nap and not 30 min!!! Good luck!