Apologies, I saw in a later post that your D does track and tutoring as a freshman. That is a good start to ECs. Admission officers always say that they prefer depth of involvement to people who spend an hour a week on many different things. And it is likely that she will add one or two things along the way (perhaps something related to her academic interests or some community service things). My S applied to a similar level of schools (different schools because he studied business) – he had three major activities and just one or two smaller things and did just fine in the admissions process.