Later that evening the friend had a sore on her lips which developed into an awful cold sore the next day. It sadly caused a rift between the friends.
You may want to inform your friends that, based on the timeline and symptoms, it's actually pretty unlikely that the bride transmitted her herpes to her friend. Primary HSV1 infections are usually asymptomatic, and when they do have symptoms, they usually present with a sore throat. Nor does it make sense for her to have developed a sore just a few hours after the alleged exposure. Chances are, the friend had been infected with HSV long before the wedding.