A friend of my DD was rejected Pre interview from a Uni. They checked UCAS today and it says offer from that same Uni - for medicine !!!!
OMG, however tempting it would be, if it was my DD, I would tell her that she has to be honest and contact them to let them know of the error. It's not just about being caught up and the implication of it, it's living through years going through medicine knowing that they got in through deception, that is if she's never found out. Who knows what the repercussion could be of her saying nothing, it might be on her UCAS application.
I do believe that honesty and good deeds always pay off in the end, and indeed, my experience is that they do. If she call them, they might actually decide to invite her for an interview after all.