I completely understand what you are saying about having a kind smile on your face...but do you see how doing that may enable her to not take you seriously? I mean if you're smiling (even just slightly) how much could this really be bothering you? (from her perspective I mean.)
I know you don't want her to react negatively towards what you have to say...but the brass tacks of the stituation is that sometimes they are going to...but you persevere anyway with your point.
