Do girls care if they see other girls nude?

The answer to that question has many variables.

First it depends on the girl; since they already have the same equipment, many girls don't find female nudity particularly interesting and don't care either way. But some girls are repulsed by female nudity, some find the human form, both male and female, to be beautiful, and some even find female nudity to be exciting, with all possible variations between repulsion and excitement.