The Mayan Priestess was the disguise of Enrique Andelusossa.
She looks like a Mayan Priestess holding a tiki-looking wand/staff.
She is threatening to her victims and doesn't like Angie Dinkley.
Powers and abilities
She can control vines by making them grow at a rapid rate and grasping her victims; she can travel on them and can appear out of nowhere from the inside of the vines. She also glows orange.
Scooby-Doo! Mystery Incorporated
He used the disguise of the Priestess to fake his own kidnapping to worry Angie so she would come back to Yucatan and there he would find out if she still loved him.