You should go to your step-children's important events.
The premiere of Maggie's favorite upcoming move is happening at the same time as her Hanna, Maggie's step daughter's, birthday party.
Maggie wants to see the movie.
Maggie takes Hanna to see the movie with her after the party.
Maggie decides to see the movie instead of attending her daughter's party.
Maggie and Hanna become closer through seeing the movie.
Hanna's feelings are hurt.