The minimum requirements in California are: Algebra 1, 3 years of English, US History, World History, 2 years foreign language or Music, 1 physical science, 1 life science, 1 year physical education, health and electives (not sure how many). For someone that is looking into cosmetology I would add consumer/business math, bookkeeping (Quickbooks,etc.), a course in communications and a general business class. I say this with many years of small business experience.
I think it is important to be able to communicate with people, know her basic math (to avoid getting ripped off!), etc. than to do upper level math to graduate.
We really like the Teaching Textbooks for math, even for college prep students. The older level of TT is easier than the new release, which has added chapters.