NW by Zadie Smith What is the meaning of the word "ambivalence" in this paragraph?

164. Semi-detached

Each time she returned to work, the challenge was perfectly clear: make it happen so it seems like it never happened. There was much written about this phenomena in the “Woman” section of Sunday supplements, and Natalie read this material with interest. The key to it all was the management of time. Fortunately, time management was Natalie’s gift. She found a great deal of time was saved by simple ambivalence. She had no strong opinions about what young children ate, wore, watched, listened to, or what kind of beverage holder they utilized to drink milk or something other than milk.