Dear Fran
You needn't worry about this.You can just tell her not to be shy.You can also say something to encourage her and to make her more confident.If she is still shy after you tell her,you can just bring her to the English Corner.There she will make a lot of friends and she can have more confidence.Tell her just have a try.And please tell everybody to believe her.Then she will surely get a good result.
Yours sincerely,
Lily