Difficulty with a CNA

I am an RN and I view myself and my CNA as team. Most of the time it works out... I treat the CNAs with respect. At the beginning of the shift I go over our patients with the CNA and at that time delegate appropriate tasks. I usually don't have a problem, like I said.

K back to me... I'm an easy-going nurse that has a very good sense of humor, I'm also not as good with confrontation as I should...but I start losing my sense of humor when I have to ask a certain CNA to get a BP like 5 times or if there is a scheduled task like rechecking a temperatiure or discontinuing a foley... and I ask if she has those scheduled task results... no I didn't do it. Or how about at the beginning of the shift, I tell her so and so needs to be repositioned every 2 hours and that I will help her if there isn't another CNA available. What is it that she doesn't get? I am not delegating things that are difficult or that she hasn't done a million times.

I feel like I'm constantly going over her work and either doing it since she didn't, or redoing things... She CONSTANTLY is saying "Why, I normally do it so-so way or only once a shift for vitals" to everything. I've tried to be nice about it, but I'm to the point where I want to say, "Well this is what I need done, and if it isn't, there will be problems." Of course I'm too chicken with confrontation...

I guess the point to this is, how do you deal with a nursing assistant (or even other coworkers) that deliberately does not do what I ask them to do??

Thanks in advance (o and I'm working on this communication problem of mine by reading a book)

Thanks...Jenn