I think you were downvoted undeservedly but what you maybe don't understand is that some people's brains just don't work at this level of abstraction no matter how you break it down and use simple words. Your explanation might just as well have been written in Japanese, it would just not register.

I know it logically follows that some people have that limitation; it's a function of the nervous system that can be limited or absent, just like one's senses or mobility. But my experience has been that blind people in particular tend to be underestimated and not given enough of a chance. So I guess my inclination was to expect that this would be the case with Kristine as well. You actually worked with her, so if you tried to explain things to her and she just didn't get it, then of course I have no reason to doubt you.