Janelle was actually told by the producers that she needed to leave the house before she returned home during Jaz and Tiana's final prank. Janelle decided to have a final talk with Andrea to see if she'd really stick up for her, and decided she wanted to go out with a bang, thus her fight with Tiana and Jaz.
Janelle and Rocky were involved in some twitter beef in late 2014, after unrelated comments bashing Sarah and her former friendship with the latter.