Marissa Mayer has done some things to try and right the ship initially.

1. Reduce flex time or work from home: The logic on doing this was questioned at the time, but working with your colleagues in a confined space has proven to be beneficial (Pixar, Yahoo, almost any start up)

2. Developing child care policies that included having the kid be close to her (or this could be Marissa Mayer).

However, she allowed herself to become a larger than Yahoo personality. How many articles were about her describing her life, things she did, she was promoting her brand, not that of Yahoo. She then fell into the acquisition trap of getting Tumblr.