The 41-year-old woman arrived Monday for sentencing in a San Luis Obispo County courtroom and presented a note with a doctor's signature asking for a postponement.
Prosecutor Dave Pomeroy called the doctor, who said the note is a forgery.
The judge immediately ordered Astumian into custody and she collapsed to the floor. An ambulance took her to a hospital.
Pomeroy told the San Luis Obispo County Tribune that Astumian will be sentenced later, but he doesn't know when.