Thanks again for all the feedback.
To answer some of the questions, I don't think there are any safety or covering up issues going on. A little more background, she is a friend of the manager's daughter. The manager keeps telling me that her daughter does the same thing and so it is just what girls this age do. I think there's a little bit of mommying going on that is causing her to not deal with the situation appropriately.
We're a very small clinic, so there are only 5 (3 of which are part time) non-clinical staff total. There's no HR department or anything like that.
Ornella, I thought of that with the dress code. I don't want to impose a dress code when it's really about one silly thing. Honestly, I wouldn't have even thought to include "Don't wear your purse and coat" in a dress code before now. I've been googling dress code examples and many of them just give a general "Professional attire" statement, which is already what my verbal direction is to everyone on dress code.
I'm not at all suprised that some of you find it less odd than others. I think it's definitely rather personal how one would react to such a thing. I'm just sort of stumped that the manager insists that she thinks this is the most common, normal behavior ever and she sees it in work places all over town every day.
I'm letting it drop, because this is certainly not worth a battle, but I will remain cognizant of the fact that neither she, nor the manager were concerned that her choices make both patients and clinicians feel uncomfortable. That's a pretty big deal for me because in our office it can be important to empathize with people who you may not agree with all the time.