Last time we checked in on Teen Mom 2's Kailyn Lowry, she and her baby daddy, Jo Rivera, had just battled it out in court after getting into a physical altercation. But apparently, girlfriend wants to go at it for round two! This gal decides to go head-to-head with her ex-boyfriend for custody of Isaac, and no — they don't get into a rap battle, because please, Jo would win hands down.......