Linda Reed argued she was ambushed during litigation with Columbia St. Mary’s Hospital when — after the curtain closed on discovery for her discrimination claim under Title III of the Americans with Disabilities Act, or ADA — the Milwaukee hospital requested summary judgment based on an argument it didn’t previously mention or allege as an affirmative defense.The hospital’s motion belatedly invoked the ADA exemption for “entities controlled by religious organizations.” 42 U.S.C …