How should I deal with my wife?

My wife will sit before her computer and say such things as “why did Nancy (her sister) send me this?” That is a TINY example of what goes on constantly every morning. When I ask her to desist, she becomes angry with me. I have tried to explain that her behavior “takes up all the room in the room”, or “sucks all the oxygen out of the room”. It is as if her little cocooned world is all that counts, and I have no time to read, reflect, think, on my own.