Regarding reassuring your husband that she doesn’t need a heavy load of several sciences each year :
With 2 levels (years) and 4 hours each week of each level of Physics, Chemistry, and Biology, your daughter has already almost completely met the most stringent requirement for top schools. She only needs 1-2 more years of one science, or 1 year of 2 sciences, to be considered way ahead. With 1SL or HL science, she’s good for any college he can think of.
(In the US, 5 periods = about 4hours, because one period is never 60mn; in American terms, she’s got 6 units of science already, when only 4 are required!)
Your husband is surrounded by people who live with Indian values. It’s normal he wants the best for his daughter as it is expressed there. The difficulty is in proving that American culture doesn’t work like this and if your daughter is to attend a “good fit” your family will have to adapt to what American culture wants.
This may help:
https://www.youtube.com/watch?v=SgN20O3VYgQ
http://www.hachettebookgroup.com/titles/frank-bruni/where-you-go-is-not-who-youll-be/9781455532704/
http://www.amazon.com/The-Gatekeepers-Admissions-Process-Premier/dp/0142003085
http://www.amazon.com/Acceptance-Legendary-Counselor-Colleges-Themselves/dp/0143117645