Not getting a follow-up call, as promised, happens more than you think. Candidates are sure they are a certainty for the position, they're expecting an offer. Then, they hear nothing. This is not only frustrating for the candidate, but reflects poorly on the company.
If after a Monday interview you were told that a decision would be made before the end of the week, by Friday you'll be having doubts if there has been no call from the company.
Does this mean you're not going to get an offer? Should you call to find out what's up. Or, should she just wait until after the weekend?