Hey, it it bannable if I play on my Girlfriends account ?

To clarify, I have my own account where I raid and my GF is leveling a fury warrior, she asked me to play there from now and then on my own pc, I was wondering if this is a bannable offense ? We aren't farming or griefing anyone, It's just normal gameplay, maybe at 80 some dungeons but that's about it, we are under the same roof, so , same ip only a different machine.
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With this in mind i noticed that any settings I change on my pc , carry over to hers, is there anyway this can be worked around ?

Example, I changed the entire UI layout and suddenly hers changed too, keybinds , bartender, etc.

Thanks for any help you can give

It's not bannable, there's just no support if something bad happens related to the account - theft or such.