During the ritual, people burn themselves until they blister. After the blister is scraped off, the substance is applied to the skin.
Authorities are searching for the shaman who led the retreat, the outlets reported.
Mapache Films, a production company for whom Rodríguez worked, paid tribute to the late actress on Instagram.
“We regret the passing of our dear colleague and friend, Marcela Alcázar Rodríguez,” the company wrote in Spanish. “Her passing leaves an immense void in our hearts and in our work community. Her dedication, joy and commitment left a deep mark on all of us who had the privilege of working alongside her.”
“We extend our deepest condolences to her family and loved ones,” the tribute concluded. “We will always remember you with love and gratitude.”
