Ok, so if she comes to work for you she's in good shape. In the real world, however, when a jackal sees a gazelle it doesn't care if it has "pouty eyes" or not. Meat is meat, the easier to catch the better.
Many smaller companies make all salary information publicly available, and otherwise it leaks out anyway. The moment she figures out she's earning half the money her peers do she's going to feel taken advantage of and hurt her employer out of spite when given the opportunity to do so. Or she'll get a raise and then still resent her employer.
If morale is bad already and turnover is high, then sure, take the jackal approach. Otherwise you're better off with happier and more productive employees.
If morale is bad already and turnover is high, then sure, take the jackal approach. Otherwise you're better off with happier and more productive employees.