If she can see that what she looks like doesn't matter to you one iota, odds are she will not see any real value in any guy that mentions how pretty she is. You

If she can see that what she looks like doesn't matter to you one iota, odds are she will not see any real value in any guy that mentions how pretty she is. You can't be swept off your feet by somebody calling you pretty when being pretty isn't how you define your worth. Very well said. The next step is that she should see that attractiveness is not the most important trait to me (or her father). With this perspective, the thing to do is not to vaccinate her, but to praise her abilities and values so she never associates her worth with physical appearance. Thus, she can skip the whole trouble altogether. So, this generalizes not to attractiveness, but what people tie their worth to.