I think she should submit the score. Schools may want the scores given she is homeschooled. I also recommend taking the SAT again and trying the ACT.
You indicated on your other post that the student has a lot of safety schools on her list and that you were considering omitting scores for her target and reach schools (for merit purposes). I think some of these schools will want to see scores, even if they do not explicitly state this.
I would retake the SAT and take the ACT. She has a lot of safety schools, which is great. She can try for the reaches and see how it goes!