When their affair was discovered, classmates gossiped and gave her dirty looks, she said.
The teen felt guilty about being with a married man with children, lost trust in people and suffered academically, the mother said.
"He is a predator that targeted my daughter," she said. "Her life has drastically changed. Her innocence is gone."
The teen's former lover, Jamie S. Dutcher, 32, of 3744 Sandhill Drive, Janesville, was sentenced Tuesday to six months in jail and four years probation.
Dutcher pleaded guilty in Rock County Court to one felony charge of sexual assault of a student by school staff and pleaded no contest to four misdemeanor charges of fourth-degree sexual assault and one misdemeanor charge of disorderly conduct.
If he completes probation, the felony charge will be dismissed.
Dutcher admitted to the charges as part of a plea agreement. In exchange, three felony charges of sexual assault of a student by school staff and four felony charges of child enticement were dismissed.
Dutcher, a former technology support technician at Milton High, is accused of having several online conversations with the girl, then sending her instant messages asking her to meet, according to the criminal complaint.
Dutcher met the girl four times at hotel and bowling alley parking lots, according to the criminal complaint.
When they met, the two kissed while Dutcher touched her inappropriately outside her clothes, according to the criminal complaint.
Dutcher asked the girl to have sex, according to the complaint.
The relationship was discovered in February when Janesville police found Dutcher and the teen in the back seat of his car parked behind the Holiday Inn Express in Janesville, police said.
The girl was a willing participant in the relationship, police said.
Dutcher no longer works at Milton High, but he works for another computer firm, defense attorney Jack Hoag said.
He has admitted to his family he was wrong, Hoag said, and he has no criminal history.
Jail and probation is a reasonable punishment, Hoag said.
"He's suffered, as well he should," he said.
Dutcher wore tan dress pants and a red collared shirt in court. He decided not to speak. His wife was in the courtroom with him.
The teen also was in court. She also decided not to speak.
Judge James Daley told Dutcher the relationship might have led to sexual intercourse if police hadn't discovered the two that night.
He sentenced Dutcher to six months in jail, even though the plea agreement called for three months in jail.
Daley also ordered Dutcher to attend sex-offender treatment and not use a personal computer.
"You must suffer something," Daley said. "There is no doubt the victim will suffer."