My understanding is if you are signed in on the same IP w/ two accounts. And there is 1 human being controlling both characters. That is dual boxing. No matter how menial the task it may seem, it's dual boxing and could potentially ban both of your accounts. I think when it comes to dual boxing I'd go with "if you need to ask, you probably shouldn't" rule
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If she isn't controlling her character when you both play I believe you are in violation and I'd avoid at all costs...
I'm newish here but that is my understanding.