Skype interviews

D got an email yesterday from a college offering her a skype interview with a student today. She’s got classes and EC commitments. Plus we dont use skype ( although she might be an expert for all i know). When you go to sign up the available times change.
Should she drop everything to do this or just tell them she had a class?

Update: she has to be at a meeting + the slots are all gone

I would have her ask the admissions office what she should do.