Her boss shares way too much
While at breakfast, I would be busy brushing up my resume and researching this behavior, which easily rises to the level of legally actionable. She has created the very definition of a "hostile work environment." Your boss may find that defending herself against a lawsuit would easily eat up all the money she is saving by sharing a hotel room.
You can learn more at the Equal Employment Opportunity Commission's website, eeoc.gov (search the keyword "harassment").

Out East Show: Westhampton Beach Brew & Grille, Hallockville Museum Farm Bees, North Fork Foodie Tour, Southampton Animal Shelter Foundation NewsdayTV's Doug Geed is heading 'Out East' to showcase the ultimate local spots you need to explore.