The charge RN specifically asked you to do these things. That means that in your time at the facility, these are your priorities. You do not nor should not discuss with, or get an apparent "ok" from the other CNAs, other than stating "I will be doing xyz this evening". "If this is an issue, then you need to discuss this with Charge RN, however, I will be speaking to the kitchen about the trays, and speaking with Mr so and so about his walk", They should do whatever it is that they do. You should call the kitchen and order the trays as you were delegated by the RN. You should go into the patient's room yourself and say "I will be back after supper for your walk". When, and only when all of what the charge RN tasked you to do should you then ask if there is anything you could do to help the other CNA's. You could, for instance, do HS care after ambulating the patient should the patient want to get ready for bed. When you take up the meal trays, you could take the residents to the bathroom, and do the same--quick washup and get them ready for bed. With all this being said, the charge nurse was perhaps annoyed. However, part of her responsibility is out of her office as well. If she says anything to you, which I am sure she will, I would say that it would be clearer to everyone involved if she were to speak to the other CNA's and advise them that you are being tasked specifically by the charge, and you are not to be tasked by them. And that you will advise them, and carry out any and all tasks that are given to you by the RN, and when you are through if time permits you will help them with anything else. Perhaps the other 2 CNA's could work as a team to accomplish tasks. But that is not your issue.