If Exeter is a real preference for her I would just urge her to remember this will not be personal. As a pp said, you don't know what they are dealing with behind the scenes. If she wants to go then this should not put her off IMO. If she doesn't then what's to stop her removing them from her application and firming where she does want to go. One of DS's top two choices didn't give him an offer until the very end of Feb. If she gets an offer and goes, once she is on the course and stuck into it, the admissions process will likely be a very dim and distant memory, unless she lets it get to her too much now. If I remember correctly your DD got most of her offers in short order so I can see it is frustrating but really, given the logistics of the whole thing, it amazes me just how well the universities do.
I have forgotten what the date is by which offers are all given out but, assuming that is not yet, then they are still working to time. If her friend's courses are not her exact one, then tbh I think that's a red herring.
Good luck to her though.