Have you looked at the SCM Outdoor Secrets and the Outdoor Secrets Companion? My sister is using mine for her 5 year old and they LOVE it – my niece literally begs to do it everyday.
My personal thoughts since I have all the SCM and several of the Apologia would be this (and is the plan I am using for my 4 and 5 yo this coming school year:
We will of course be doing nature study and nature walks. (We just got home from home where my soon to be 5 year old found and identified the cardinal we could hear singing. We saw 2 baby bunnies and looked at the little tunnels in the grass that they ran into to escape us. We learned about identifying poison ivy, honeysuckle which we could smell and see, identified and observed the butterflies, etc…all this in context because my older daughters are doing it too). =)
Anyway – in addition to Nature Walks and Study (plus the backyard feeders, flower and veggie gardens, etc) we will be doing:
K – Outdoor Secrets and Companion
1 – 106 Days of Science
2 – Considering God’s Creation
3 thru 6 – Apologia – botany and zoology most likely, plus whatever else I like
And during this time, once my girls are fluent readers, they will be reading the Thornton Burgess books as additional science reading on their own. My older girls love these.
I would definitely use the Delightful Reading and Handwriting together if she is ready.