Unfortunately, there isn't a way to see what staff has viewed your students pages in the Admin side of PowerSchool, they can only see any changes made.
Admin users of PowerSchool can view all students in buildings they have access to. As @jsonsiadek mentions there is no way to tell who has viewed a paged, but if the district has Change History enabled (which they may not) they can only see changes made in the categories they have configured.
PowerSchool Support is correct: there is nothing they can do; you must deal directly with your child's school district.