I would never ding a kid in my report who was shy or nervous. IMO, it’s my job to help them feel comfortable. For many many students, alumni meetings are their first ever “interviews”.
I also think it can be very real for a student to not have a firm idea of their major at that age.
Not being able to articulate interest in the school and how they can contribute on campus is more of an issue, but if it’s not coming through in the interview, it probably didn’t come through in the essays either.