My eldest will do dual enrollment at the community college while in high school. If she completes enough credit, she'll be a transfer student, not applying as a freshman, like a PP wrote. If she doesn't earn that many credits, then I will have her write a transcript based on what she's learned at home and through dual enrollment. I will also encourage her to take CLEP tests, if she discovers that she tests well, like I did.
I don't plan to write transcripts for any of my kids. Help them, yes, but not write them.
The colleges I've pre-selected for her (just as ideas, of course she's free to go wherever she wants) have info on applying as a homeschooler.
Here's an example:
https://college.lclark.edu/offices/a...es/homeschool/