There is no magic number. My D took 5 and one dual enrollment course and was admitted to several T20 schools. The way her school did scheduling this was about the max you could take and I’m sure her counselor marked the “most rigorous” course load on her common app recommendation which was what she was going for since it was an easy way for colleges to know how her schedule/course load stacked up at her school.
I would not bother retaking the tests. Scores are great. My D was pretty much in the same place with scores.
One thing I did notice: Is your daughter not taking math senior year? You might want to check requirements at the schools where she is applying to make sure 4 years is not a requirement.