Saying Jaina is going "full Alliance" is like saying Garrosh is going "Full Horde".
First off, just like Garrosh, Jaina was never a neutral NPC to the Horde in-game. She just wanted peace in her story and that's it. She has always been an alliance-specific character we interacted with. Hell, Horde could raid and kill her since Vanilla day-1 if they wanted.
Secondly, she's not going "Full Alliance" - she's going Full-on angry racist potential-future-boss mad like Garrosh Hellscream is.