Nobody can match the enthusiasm of a four year old on a mission to learn, LOL! Not you, not me, not a school.
This is why I think it's important to give them direct access to the world and help them find out what they want to know. In many ways an adult with an agenda can be a hindrance to the child's learning.
If your daughter likes preschool then she might like school, at least for the first year when school resembles preschool more. Or she might not. Do you feel it's appropriate to let her choose? Some parents do. Other parents believe that a very young child doesn't have the perspective to make such a decision, and parents should go with whatever seems best to them. However, I've hardly ever met a home educating parent who didn't let their older child make the choice for herself about whether to go to school.
My older daughter had the choice. Because she was already well stuck in to HE friends and activities, she didn't want to give that up, so she started off with home ed. For your dd it might be the other way round, since she already knows she likes being at preschool (and that school is sort of like preschool) but doesn't know what home ed might involve. When my dd was nine she tried school, with my encouragement, and came out again after a term. It was a very useful experience for her, but I don't think it is an experience which all children need.
My younger dd was different. I never even suggested to her that school was a thing she could do, nor did anyone else, and it never occurred to her. I am firmly convinced it would be harmful for her, then and now. Because she was brought up surrounded by many home educated kids and only a few who went to school, HE was her "normal". She was eight years old before the concept of being at school herself even crossed her mind. It didn't appeal to her.
Of course it isn't wrong of you to want to home educate or flexischool. (IMO it would be wrong of you to persist with it if you try it and your daughter hates it.) Contrary to popular belief, I think parents usually have an instinct about what's right for their child. I suspect that home education appeals to you not just because you think it could be fun for you, but because on some level you feel it could be what your daughter needs.