I am not a nurse however I have been working as an ER tech for 7 years and have numerous negative encounters with other staff members because I always stand up for myself, and will not be spoken to in a negative manner.
Aside from that, I am very sorry that things aren’t going good at your new job. It’s unfortunate that this one individual is going above and beyond but it is time to get employee relations involved.
Have you spoken to your nurse manager regarding these incidents? If not, I would write them a very detailed e-mail regarding this, cc employee relations, possibly risk management, patient relations (due to her being aggressive towards a patients family members during a stressful time) and a higher up chief nursing officer about everything that you mentioned above. I would request an immediate 1:1 with the CNA that is doing this and have Employee relations present along with your nurse manager and Chief Nursing Officer (whom is above your nurse manager). Let them know you are honestly trying but you are being bullied and you refuse to allow others to treat you in such a way, which you shouldn’t have to. Also mention that it is very stressful time with everything going on and you should not have an additional stressor =the bully.
Also, that you do not feel safe nor do your patients, patients family feel safe.
Pull up the employee handbook and look for code of conduct, and the steps to being fired. Normally they list like what happens when you are aggressive towards staff members AND patients. Make sure you point out that her behavior strictly goes against company policy. Ask them in private if you are allowed to record her be aggressive to you, of course without her knowing that you were doing so.
Workplace bullying has always irritated me. I don’t feel that any position, in any role should allowed to be bullied. You as an employee, should not have to endure that kind of behavior from a staff member.
also mention how when you asked the bully to do a task within her scope of practice she gives you attitude/she refuses to do it, she was very hostile towards a dying patients staff family member. I would be aggressive towards this situation because honestly it is time for you to be aggressive back. I personally do you not trust anyone that I work with. I would do the same if I was you. Let me know how everything goes. I wish you the best and I am so sorry that this going on.