Final answer:
Maddie performed the solo 'Shades of Grey' in a dance battle against Nia during a competition on the TV show Dance Moms.
Step-by-step explanation:
In the “winner takes all” competition featured on the show, it was Maddie who performed the solo “Shades of Grey” while battling against Nia. This performance was part of a storyline in the reality TV series Dance Moms, which showcases the competitive world of dance competitions and the interpersonal drama between the dancers, their mothers, and dance instructor Abby Lee Miller.
The dynamic of the competition, along with the individual performances, often highlights the intense pressure that young dancers face, as well as the expectation to deliver flawless routines under the scrutiny of judges, an audience, and their dance instructor.