In Chapter 13, what is Rose's main concern about being a guardian?

When Dimitri notices that Rose's hands are raw and bleeding, She tells him about her worries that being a guardian will destroy her good looks. Rose is described as very attractive, especially when compared to the Moroi girls, who tend to lack any womanly curves. Rose does not want to cut her hair either, but Dimitri assures her she can wear it up instead.