My daughter is a bridesmaid at a wedding where the bride's daughter has foot and mouth disease, can she catch this or what about transmission of this?

Contagious, but...: Most adults have already had hand/foot/mouth disease, so even if she is around a kid who has an active case, she is unlikely to become ill. If still worried, just avoid sharing cups and eating utensils with the child and don't kiss her. There has to be body fluid contact for transmission to occur. Just being in same rom with her won't transmit it!