Laura Nicole Lasek, of Yuba City, has already been released from jail on $211,000 bond, according to a news release from the Marysville Police Department.
Lasek was arrested Friday on charges of unlawful sex acts with a minor.
Officials at the T.E. Matthews School reported the allegations to police, which prompted a full investigation.
It was Dec. 4, 2014 when a para-educator overheard some students gossiping about Lasek sending the alleged victim sexually graphic messages on Facebook.
The worker told school officials, who confronted Lasek and contacted police.
Lasek was then placed on administrative leave.
Marysville detectives investigated, and followed up with the boy in question, a 15-year-old.
The alleged victim told detectives he had been in a sexual relationship with Lasek for about two months, police said.
Officers questioned Lasek on Friday, then booked her at the Yuba County Jail. She is accused of oral copulation with a person younger than 16 and unlawful sexual intercourse with a person younger than 16.
At this time, there are no other known victims, police said.