How do you deal with an insensitive CNA?

She doesn't need to be fired. She is used to having her way. Maybe this new nurse can speak with the CNA about her behavior. Then if she continues she can report it to her manager. Then it is up to the manager what is done. Wow, i'm glad that i don't work with any of you all. You guys are quick to want to fire some one.

I'm a new registered nurse, I work on an Alzheimer's unit. There is a CNA who is being repeatedly scheduled on my shift, and to tell you the truth, I just don't know what to do with her. She is way older than me, and has been a CNA since I was 8 or something. She feels like she is firmly in charge of the unit, and tells the other CNAs what to do, when to take breaks, and when to go home, and then loudly informs me of her decision.
What concerns me the most is the way she treats the residents. When my one my residents was talking about her husband, the CNA informed her quite flatly, and publicly that her husband was dead. This made my resident cry. Later, the resident was talking about her home and family, and the CNA told her, "You're not home. You're in a nursing home. Your family brought you here and left you." The resident started to really cry then, and say, "My family would never do that to me!" "Well, they did!" is what the CNA said back, and laughed. My resident was distraught by this time, and so was I.
Later, this same CNA ignored me while I was desperately trying to get her attention to get her to get up and put a walker in front of a wondering resident who is a fall risk. She was chatting it up with the girl from housekeeping. I finally shouted at her to get her attention. I never shout at anyone. I didn't know I had it in me, and I shocked myself. It still feels hot in my chest. It gave me a headache.
I am frusterated. Please give me advise on what to do about this.