That is true. Her interviews change all the time.
Though I do think the writers are purposefully portraying Arizona this way at the moment. I feel that at the moment she is a ticking time bomb waiting to explode, because she always keeps everything inside.
If interested I always find the reviews from this site enlightening. And I feel they are one of the few that actually get Arizona as a character:
http://www.fempop.com/2013/10/25/eve...greys-anatomy/