Wait until school starts, then ask her teacher their preference. Four kiddos (oldest is 23) and I find the school supply list and teacher preference is not the same.
With today's computer programs and apps, I would think they would allow a computer version or smartphone app that has the same features.
The difference in the brand calculators is normally just the decimal points. In college, our professor knew each brand decimal points and could tell you what brand you had by your answer.