Be calm at all costs. I cannot stress this enough. I too get emotional and let the tears roll and sometimes get rude....but control it as much as possible. You're human, so if you slip, don't worry or beat yourself up, just quickly recover. My H has real issues with my anger, rightfully so. But, I cannot promise that I'll never get angry, just that I will handle it differently. Same with you.

Really, you need to meditate or something before this. Just be calm, still, numb if you have to.

With this whole process, don't resist. Just be yourself, be nice to her, change things in yourself that you needed to change...FOR YOU. The rest will come.