Explanation: Judith and Nathaniel are in the intensifying stage of their relationship, Intensifying stage is a stage of finding mutual affection. In this stage the relationship becomes less formal as the individuals become more common to each other, they begin to discuss their level of commitment to the relationship with some sense of ownership towards one another. Caring about the appearance of one another in the public eyes.
Self conscious because she doesn't want anyone to make fun of her or to show anyone else her body because maybe she doesn't like how she looks or someone has told her that she isn't beautiful the way she is.