 On her 30th birthday, Liz snaps. She decides to become a new person through improv comedy, and she ends up working with Tobin on her improv and their marriage. In order to take the time to work on her transformation into the new Liz, Liz moves in with her sister and her niece and starts working on an idea to pitch to her boss. It's a totally understandable and admirable goal. She just wants to move out of her outgoing husband's shadow and be seen as her own person.