Shy or social anxiety?

So Trinity is generally ok around people she knows well or even people she has met like once. But when she is introduced to a new situation she clams up and cries like nobody's business. Of course most of you know we do home school our kids, and today is the first day she still had to go and take the State Standardized testing, and dear lord you would think the world was coming to an end. She could not sleep well last night, and this morning she would not eat anything at all really. She said her stomach was tied in knots. When we got the the facility where the testing was she started breathing heavy and saying she was gonna be sick. She never did get sick, but then started to cry uncontrollably. I still had to take her in because if we are late for registration she can not test that day. She kind of calmed down a little when she saw a little girl about her age that said she was so nervous, so she and Trinity had something in common then. But when it was time for mom to leave she started all over again crying and I could not stop the tears. The leader asked me nicely to just exit the room and they would talk with her.....I don't know how long it took her to calm down, once the door was shut I could not hear anything. I have not gotten any phone calls from them so I suppose things went o after I left. I just feel bad because I don't know how they expect children to do well on these things when they are thrown into a totally different enviornment, one where they know no one nor have they ever been to before, and still expect them to do well on these tests. My heart breaks for her, I feel broken inside for her, its hard.

I don't know if it is just her being shy, or if she has some social anxiety going on. It scares me, I was borderline that was for a long time and I got to a point where I just snapped and said I AM DONE BEING LIKE THIS, and started throwing myself out there and I was a lot happier for doing so, but she just does not have that personality!