I agree. If the science class excites her, she should take it. Schools – even very selective schools – want to see a schedule that reflects the student’s declared interests. If your D only had one or two years of language, it would be a different matter, but she’s already met the requirement for most US schools.
High school is more than a race to the best college (then the best internship / job / promotion.) It should be a place to explore and develop interests. That’s why my D2, who is looking toward engineering, is skipping AP Chemistry in her senior year to take AP Music Theory – with my blessing.