The real issue here is that she is so quick to lie to you in order to prioritize her social life over your potential health. Huge red flags. "No pasa nada?" Tell that to the people in Italy. Looks like you have some soul searching to do to see if this is somebody you want around for the rest of your life; somebody who has shown themselves to be an "egoista" when times get tough.
A lot of Argentines - probably the majority - do not like to plan in advance (except for vacations) or take precautionary measures. It's just not in the culture. Some Argentines who have come back from Germany or Switzerland told me how rigid they found the societies. It's that 'rigidity' that has made them successful. I hope your wife isn't sharing mate with her neighbors!