In a typical crowd, Silial stands out for her all-black attire dripping ruffles and lace -- if one can see her at all. She is, after all, a head and shoulder shorter than most. While she may be a druid, it is no excuse for her to dress and act like a savage.
Upon closer inspection, it becomes readily apparent she carries no metal on her person save the coins in her purse and a keyring buried deep in her pack. That is one of the few obvious signs she is a druid, or as she likes to advertise herself: a witch.