Don't over-complicate this! There's no need to worry about "missing out on lessons." Some things are taught in school because they're important bits of practical knowledge or basic skills, things that are essential in the 'real world.' You don't have to worry about this stuff being learned because your child will be living in the 'real world' and will absorb those skills and bits of knowledge organically.
(I once had a well-meaning teacher ask me how I made sure that my KG'er and 2nd-grader learned all the fiddly little parts of math, "Like ordinals," she said, "Lots of kids learn to count, but they need to be taught words like third, fourth, fifth and so on." I practically rolled my eyes out loud: how could my kids, living their lives alongside adults who interacted with them all day long, fail to have learned these words for ordering objects?)
Anyway, some KG/elementary school learning is important because it's part of real life, but that's the part your child won't need to be taught, because she's part of your life all day every day. And some stuff is taught that doesn't become a building block for other skills and doesn't come up in real life, and that's the stuff you might miss out on. But here's the thing: a huge portion of kids in school will not retain that learning, so it'll be taught over and over again. And if you miss it with your kid in 1st grade, and she starts school in 3rd, or 5th or 9th, she'll have an opportunity to learn it then, along with most of the school-children who have only the vaguest memory of ever being taught it before.
My eldest dd, now 20, was unschooled until 9th grade. She was extremely focused on reading, writing and music, and hadn't ever touched a science curriculum. She started school at age 14 and decided to take 10th grade science rather than 9th grade. She did really well in the course. I remember us noticing that there was a fair bit of material in the chemistry portion of the curriculum, even though it started with the absolute most basic intro to what-is-chemistry and what-are-atoms and such. It was only years later when one of my younger kids borrowed the 7th, 8th and 9th-grade science textbooks from the school that I realized that all that basic information was also taught at all three of those levels, and the reason the 10th grade book had a lot of chem in it was that they were re-teaching it from scratch for all the kids who had forgotten or never mastered the basics (or in my dd's case, never encountered them in the first place).
So two things should reassure you. First, even if you do little to no systematic teaching, your daughter will naturally cover a lot of stuff that gets written into curriculums. Second, gaps are ridiculously easy to fill, if they need filling at all.
I too have to submit a learning plan for each year. Even though my dd is now a 7th grader our plan largely consists of statements like "Materials which will be made available will include _____" and lists stuff like on-line video channels, library books, real-life resources like kitchen tools, DVD documentaries, out-of-home activities, mentors and such. Our supervising teacher loves our learning plans.
Miranda