Interview- chances of acceptance

Hello,

My sister would like to ask anyone who can possibly answer and/or give her some advice on interview for University of Rochester. Since she doesnt live in US and potentially not reached by visits, if she schedules an interview it might be off campus Skype option. She is confused and mixed since she is afriad not being able to impress the interviewer and thus make the whole application portal less competitive.

Any of you know if interviews may boost the chance for acceptance?

Thank you so much!