Thank you for your suggestions. I still dream of some sort of boxed curriculum. I am not a good planner so I wish I could find something that plans everything for me.
But I certainly see your point. I had some very good experiences with weaving things together. I just need a jumping off place, kwim? When our younger dd was a baby, she grew incredibly fast - she weighed sixteen pounds by the time she was two months old. I was always buying the wrong size of disposable diapers, or having the backup clothes in her diaper bag be too tiny.
It feels the same way with her homeschool work. I will buy something for her level, and before I even have time to get it out of the package and plan something, she's gone beyond it.