Lets say that I was once struck very hard in the head by a frisbee, and the moral center of my brain now causes me to believe myself entitled to live in Malibu.
Wanting something is not the same as deserving something.
If you'd previously been living in Malibu for decades you might actually have a case.
My entire point is that I reject this ridiculous premise. People who currently live in SF don't have any more of a "right to SF" than anybody else. Thinking otherwise is just plain old xenophobia.
The only land that you ever have an indefinite right to is land that you have purchased. I don't get "special privileges" to Seattle or Philadelphia just because I have rented in those two cities for the past 15 years. You don't have some sort of "special right" to your city either, unless you have seen fit to purchase property there.
Basically the moral center of our brain, by default, views her leaving as a choice, and you moving as a choice. Rather than her staying vs leaving as a choice. Looks dumb when you parse it right, feels right when you parse it wrong.