Issues with nursing staff

I've been assigned to the same clinical unit for 5 years. I am currently in my 6-week summer rotation with the second year ADN students. In addition to my group, I covered my colleague's clinical group this week. I had a "talking to" by a nurse this morning about my colleague's students. Her complaint was that her patients were not bathed and the students don't give medications or "do anything for that matter." Our objectives for the course are to begin delegating and focus on the RN role, including a 3-patient assignment for the students. I assign half of the students to give medications each day. I explained this to her, but she did not want to hear it. The secretary also chimed in, asking why the students didn't need to learn how to give baths.

So I thought about this on my way home. 1) She had 3 patients with the students, 2) One patient was transferred at 8:30, 3) One independent patient was being discharged by 10:00, and 4) The nurse administered medications for a student by 7:45. I also recall walking past the desk and she stopped mid-sentence about "new nurses these days", which I feel was now directed at me and the students. Two nurses gave the students glowing reviews, so I don't think her comments are truly warranted. In fact, I had 5 students in one room helping with extensive wound care and a bath.

Today, now with my own clinical group, she told a student not to touch a dressing until the surgeon/PA came to look at the patient on POD1. It is CLEARLY communicated that the students report off at 12:30PM for the day. Well, the surgeon came around at 1:30, and the nurse came asking why the student didn't do the dressing change.

I should preface this by stating that she always has an issue with a student. There have been many instances where medications have been missed in her assignment, or as mentioned above, she has given medications for a student. I do provide a written list of the students' responsibilities attached to the assignment sheet on the board every day. I've spoken with the nurse manager in the past, and honestly, nothing has been done.

So my question is... How do you handle working with a staff nurse who has a difficult personality? How do you help them to understand the objectives? Most importantly, how do you protect yourself in terms of who's accountable for what?

It is easy for me to say that it's impossible to supervise medications with 10 students and 30 patients and babysit.