Mort- be cool when you chat. The sole purpose of the discussion is to clearly define your supervisor's expectations. It would be foolhardy to expect to change another's personality; hopefully your boss has a clue to that.

You are seeking to gather objective information from this exchange. You need not offer your opinion. Get the info, politely (and positively) thank her for the input and then assess the data.

As Allen said, let us know how you do....