Bquiggins

So I'm a CNA and I have been for over 6 months. I've been working at an Assisted Living Facility and I absolutely love my patients and geriatrics. My only problem right now is that my facility is not a dementia care facility, but we are constantly getting demented residents. One of these residents has been under my care since I've started working and, although I care about her very much, her dementia is progressing quickly and it is affecting my motivation to go to work. She has become violent and screams at me during NOC shifts. I used to be able to handle her very well, but now that she cannot recognize me and her dementia symptoms are taking control of her, I cannot handle it any more. I know that the term for it is "compassion fatigue", but I'm really disappointed in myself when I feel like screaming back at her. Does anybody have any advise for keeping my sanity while also helping her keep calm?