UKgraduate is obviously a dishonest reprobate him/herself. Only someone equally guilty of such an offense could paint one who exposes this crime as 'uptight' or merely in need of inebriated relaxation.
There is a very clear reason why the concerned person should do what she can to make it known to the authorities at both schools that her acquaintance is forging letters: the girl is, quite obviously, not the sort of person that any graduate program wants, because she is intellectually dishonest. One would never know if an idea she published were her own or plagiarized. Even if these grad schools don't know they don't want this gir, they'll find out eventually. This sort of vice doesn't persist for long without revealing itself. The result is one or more of the following: some infinitely more worthy applicant will have been denied admission to the program because this liar was admitted instead, the reputations of the teachers in whose name she forged letters will be tarnished among the faculty of the school to which she is accepted (since it will seem that they wrote glowing letters for a miscreant), or the school that she came from will gain a sort of subliminally bad reputation among those who know about their dishonest student. This girl has an obligation to tell those who would be interested in knowing. Doing what's right here will only earn her a bad reputation among slimy, unprincipled people like UKgraduate, and who cares what they think?