Arica was the alias used by Mara Jade when she infiltrated Jabba's Palace in 4 ABY. Disguised as a dancer, her goal was to get close enough to Luke Skywalker to kill him, as Palpatine had ordered her to.
However, Jabba realized Arica wasn't what she appeared to be when she tried to use the Force to influence him to let her come on the sail barge with him. She was prevented from boarding it secretly by Melina Carniss, Jabba's slave overseer, who believed she was trying to kill Jabba.
When Oola was fed to the rancor, C-3PO spoke with Arica, who told him about Jabba's predilection for dancing girls and the dangers they faced.