Frozen
Hadley has been singing music from the movie Frozen and it just seems to put her in a happy mood. She also has been loving to have her hair in two braids like the character Anna for days. Up until now she has always just wanted her hair down.
While she didn't actually love the movie (she really isn't a movie watching kid), it still has clearly had its impact on her. I think her peers have a huge impact in relation to the movie.