To the OP -- honestly, Valtrex is used so commonly for cold sores, that I really doubt that anybody would look twice at it.
But, if you are still worried (which, is nevertheless, understandable) I agree with others that you should just tell her that you do not feel comfortable giving that information because there are no privacy safeguards.
But, if you are still worried (which, is nevertheless, understandable) I agree with others that you should just tell her that you do not feel comfortable giving that information because there are no privacy safeguards.