I understand where you're coming from. I don't know you, but I personally don't think you need to take time off. Waiting for these acceptances is a very stressful situation. I don't think it's fair to tell her to calm down just because she has already been accepted into two schools. It depends on her goals and personal school rankings. Furthermore, the stress is about getting into the school she wants, which will essentially ensure the wellbeing of her future, a legitimate reason to be stressed.
In terms of grades, obviously I am merely an applicant and not a member of the admission committee, I think the B+ reflects an anomaly. Remember, people are allowed to make mistakes and as you said yourself, it only lowers your cgpa by 0.1. They're going to look at you as a whole person and I don't think 1 B+ will cause a rejection.