Wow. I have no idea who Quill, National Bellas Hess, or Wayfair are, or what "nexus" is, besides a term in physics and higher math (and I know what it means, just not how it would apply here).

She has two 1099s, both around $30k. One of those 1099s has an address in Ohio, and the other in Missouri. 

I don't know which of her jobs apply to which 1099, but I do know that she worked primarily from home (in Oregon, which will tax everything and ***may*** give her a refund for income taxed by other states), and also did the following work-related travel: 16 weeks in San Francisco; 4 weeks in New Orleans; 1 week in Ohio. It is possible the Ohio travel is related to a portion of the income reported on the 1099 from Ohio, but not 100% certain.

Let's take CA. I used to be a tax prep in that state, and I know they like to tax everything. If they find a way to tax poop they will. But there's no 1099 from CA. How would FTB know she earned money there? If she's required to pay, how much should she pay? Should it be based on the income she received from CA (which is technically $0, according to the 1099-MISC) or the amount of time spent in CA?