I have found out that women, and esp. teenage girls, are very insecure about their bodies—even when flaunting their bodies. Many of them flaunt themselves because they are seeking that approval, even if it is only a sexual approval. Every time they can get a man’s attention with their body then they feel that much better of their own body. I think it is horrible that women do this to themselves and make us men their unwilling victim. But you can use this to your advantage. Pay little attention to her, or better yet, make any sort of attention you give this granddaughter negative, scowl at her, or look at her like she is a piece of filth—if you can undermine her feelings of security in her body—there would be a good chance she will cover up next time she sees you or better yet, just avoid you at all cost.