Advice

Just wanted some opinions on this to know if I'm over reacting. I work dayshift and the nightshirt nurses are always late. I've informed my DON several months ago but it still cont's which means I have to stay late until they arrive to work but the nightshirt nurses always leave on time because we have adequate staff. My question to you all is......the other morning in our meeting I brought it up in front of several day and nightshirt nurses along with our HSA who is the number one person in our medical department. One nurse who is late every night got very angry and called me a ghetto snitch and had to be escorted out of the room by the HSA. She also looked as though she wanted to come at me in an aggressive manner. I let it go but the more I've thought about it the more upset I get because I was told by my HSA just to avoid her when she comes in and the only reason she got mad was she knew I was right. I think she should be fired.