I also have long, coarse, thick hair (I'm a white chick) - I am routinely charged $10 - $15 more than the usual cost of a cut, and am usually charged double for things like highlighting and coloring, because it takes twice the product and time for the colorist.
It's not unfair - it's just sensible. Dillard's will probably pay her off, though, and raise prices for everyone.
You deserve a Gold Medal for stating the obvious.
...Methinks this Trial Lawyer wants a big Pay Day.
-Regards, T.