Shocking news of Pat's monstrous transgression on Boxing Day!

Pat's daily diet usually consists of 13 gallons of black coffee, 2 leaves of lettuce, and a crust of dry bread. Today she was driven to eat COOKIES by Mo, who has successfully taken up the conservative cudgels on her late mother's behalf.

Not being one to tell tales out of school I'll not devulge what it was about, but here's a HINT.

Forensic Proof - Pat's cookie crumbs