After going out with her boyfriend for 6 months lucy finds herself often talking about we and us rather than i and me. this self-definition change is referred to as

COGNITIVE INTERDEPENDENCE. Here in this scenario Lucy is surely undergoing a critical change in her thinking, mind and body, where shes getting matured enough to feel, analyse and realise what is happening to her, around her and her surroundings, where these are the clear signs of self change which is defined by lucy only within in herself and her boyfriend for sure.

Joke: i thought it said drake and josh at first answer: probably unsure about this law. depending on how long the time is.