I've noticed that whenever Sallie is insulting Gina's skin or hair, Gina always responds back with either "shut up" or a one-liner that always outsmarts Sallie
The only time she's insulted her appearance was when she commented about her cheap primark shoes, which isn't that bad considering Sallie can change that, where as when Sallie insults Gina, it's always something that she physically can't change.