#1 What "Brie Mode" really means...
WWE decided to cash in on the term "Brie Mode" back in 2014 as part of Brie's feud with both Stephanie McMahon and Nikki Bella. But it seems that in a PG era for the company, this probably wasn't the best thing to promote.
Brie revealed in an episode of Total Divas back in 2013 that "Brie Mode" was when she gets incredibly drunk and does some questionable things.
Nikki enjoyed getting her sister into these kinds of situations, but it seems that her husband Daniel Bryan wasn't a fan of his wife's drunken antics.
So when WWE allowed Brie to perform on WWE TV wearing "Brie Mode" themed clothing, they were actually promoting the fact that Brie likes to get drunk and do stupid things, some of which the company shouldn't be condoning.