Four courses in any discipline except English(and math for select colleges), even if in less than 4 years, counts as 4 years. If she takes physics next year, then it’s fine not having a science course as a junior. Self studying for AP Chem exam does not count as a year of science. There may be valid reasons toslef study, but college admissions is not one of them.
On another topic, switching between first person and third person means that the parent is posing as the student,or two people are sharing an account.Both violate Terms of Service.