My Daughter Is Five, Been Potty Trained A Loooooong Time,

My daughter is five, been potty trained a loooooong time, and has recently started peeing in the floor. I'm picking my brain trying to figure out why. I have noticed that she has been preoccupied with something else at the time, like watching a movie or laughing at her sister. But why is it a problem now? Just started a week ago. This is her third go.