K.L.
I just got done reading an excellent book called "Parent Effectiveness Training" and this issue would fall under the category of a problem that your daughter "owns" meaning there is really nothing you can do about it. You can offer your empathy and listen to her if she can discuss it with you, but you can't solve it for her. I can remember being painfully shy in certain situations as a child and perfectly comfortable in others. Still am actually. I think this was just something I had to figure out for myself.