Alum interviews are generally part of the admissions process, scheduled by admissions with assigned interviewer after application is submitted.
You can generally request a meeting with professors in your intended major. This is a more in-depth approach to a visit and helps chose a major, solidify or dismiss an ED school selection and get information supplemental essays, Why do want to attend ‘X school’?
Don’t be surprised if your D is asked for all of her stats prior to scheduling a meeting at a super-reach. We viewed the search as a two way process. Our children learned a lot about opportunities and themselves by meeting professors, investigating departments and labs and attending classes.