How rude!!!

My sister that was living with me for a while came over today to get clothes for her senior pictures since lots of her stuff is still at my house even though she no longer lives here. Well I just came in to lay on her bed because I am mad and need to cool off only to see that when she came over today she changed her clothes and left dirty, bloody, period underwater on the floor for me to clean up and wash. How rude and disqusting is that?!