4.1.2 is solid. Since it's your wife's phone, personal experience allows me to say leave it be
. Lord help me if Candy Crush doesn't work.....
But you have an option.
A time saver to get to 4.3 and rooted on your current bootloader would be this.,,
AT&T UCUBMK6 i317 *Odexed* Stock ODIN Note 2
It's already rooted, all you have to do is debloat with Titanium BU or whatever.
From the thread -----> If you *are not* running Official 4.3 (MK6) or newer bootloader: After flashing one of the firmware packages above (the Stock ODIN)
flash the bootloader package below in Odin to get wifi working (sorry, no option available for CWM/TWRP). I've included the Odin executable just after if needed.
Bootloader needs to be flashed only once. See post #2 for information on how to check what version of bootloader you have installed.
This is what you will flash:
AT&T i317 ODIN 4.3 UCUBMJ4 (Leak) Bootloader & TZ (AT&T Note 2 ONLY)
This bootloader will not trip Knox.
Please get out of my Van Halen t-shirt before you jinx the band and they break up....