Azula has, so far, showed a lack of curiosity regarding why the loops are occurring.
I assume that's because she already had the panic and crisis over time looping endlessly the first two times around (along with the general madness brought on by the mental/psychological chickens coming home to roost). And as of now, the story isn't about the mechanics of the loops - it's about Azula, and how she uses the loops to self-actualize.
Still, I do wonder if the story will ever get around to the nature of the loops and if an explanation is forthcoming.