K.B.
My daughter is 8 mos (I also have a 4.5 yo) and has just started staying awake 3 hours at a time...maybe your little one is overtired. I know it sounds silly, but being too tired can be just as bad for sleep. Honestly, I think the EASY is a good starting point and has good ideas, but your baby will show you her schedule if you give her a chance. Since you're at home with her you could plan a couple of days where you don't have activities planned outside your home and watch her for cues on when she wants to eat or sleep. I am a scheduled person so it was really hard for me to let go of the concept of scheduling my baby, but once I did all of us were much happier. Besides, at 9 weeks she's starting to "wake up", I bet once you give her a chance to tell you what she needs everything will work out well! Good luck!