Nia's first run as Raw Women's Champion was abysmal. I'm not exactly a big fan of Nia's, but she's preferable as a heel than as a face as she's just completely bland when she tries to be "good." I'm also glad to see that WWE is embracing the whole #Facebreaker bit instead of running away from it or trying to pretend that it didn't happen as it's actually making Nia somewhat interesting.
With that being said, Nia Jax should not be the one to beat Ronda Rousey, in my opinion, and I don't think it'll happen at TLC. IF the plan is to do a match between Ronda Rousey and Becky Lynch for WrestleMania and to have said match close the show, as is a rumor going around, then Rousey shouldn't lose via pinfall or submission between now and WrestleMania. Maybe let someone score a few wins here and there via count our or DQ, but Rousey truly and genuinely losing her first match, given how over she is, needs to happen on a much bigger stage than TLC and it should be against someone that a lot of fans would really, really want to see beat her.