After being admitted to the hospital for observation, two more individuals were released.
The presence of mushrooms in the beverage is being looked at by detectives.
On Saturday night, at approximately 11:50 p.m., paramedics were called, but the 53-year-old woman passed away there.
The wellness center, located in the historic village of Clunes, bills itself as a holistic and alternative medical establishment.
Tarot reading and sound healing are among the services offered by the center, according to its website.
