First, this is definitely unorthodox and she should mention this to the recruiter (if they don't move her to the next round). There's no downside to mentioning it and the upside is she might get another shot.
That said, try to be careful with “unfair”. Every case and interviewer is different so fairness is really hard to measure! As a candidate you well and truly have to be prepared for anything to happen!
Furthermore, she does need to get used to things not going as planned - the job is going to throw all kinds of curveballs at her (a timer in an interview is nothing compared to high level execs yelling at you) so she does need to learn how to be a lot more flexible/adaptable in the face of the unexpected!