I would also not discipline for it. I had this problem at times as a child, and can absolutely say that being disciplined, embarassed (ie, my parents attempting to force me to talk to the person while still in front of the person), or putting me on the spot did absolutely *nothing* to help me move beyond the problem. If anything it made it even worse.
In my case, I would say it was a combination of naturally being shy, being unsure what to say, insecurity, and even a fear of rejection all sort came together to almost “paralyze” me, as Nebby put it. (I didn’t realize all that at the time, of course, but looking back, I think those are all factors that played into it.)
I would try to talk to her, gently and kindly in a non-pressure situation, about what might be behind it, and take steps to address the underlying issues. Ask her how you can work together to help overcome the problem. Take little, tiny baby steps if need be. Let her know that you are on her side and not her adversary in this. Help her to understand that the Lord can help her to do things that are hard or that she doesn’t want to do – pray with her and for her about this. And be patient – in my case plain old maturity helped a lot. Ages 7-14 or so were terribly awkward and uncomfortable for me – especially in social situations – but time, experience, and especially support and encouragement from others helped me to slowly come out of my shell.
HTH some,
Jen