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By Carolina Gonzalez and Jon Schuppe

The mother of "affluenza" teen fugitive Ethan Couch returned to Texas Thursday on charges she helped her son flee to Mexico.

Tonya Couch arrived at the Tarrant County Jail after a flight from Los Angeles and was expected to be arraigned Friday morning.

"She was very quiet, very reserved," Tarrant County Sheriff Dee Anderson told reporters. She also was "strangely appreciative," Anderson said.

Couch's son, Ethan Couch, remains in an immigration detention facility in Mexico, where his lawyer is challenging an attempt by authorities to deport him.

Anderson said he was "confident about getting him back," describing it as a "question of when."

Tonya Couch is escorted to a waiting vehicle after her arrival at the Dallas/Fort Worth International Airport in Grapevine, Texas, on Jan. 7.LM Otero / AP

Tonya Couch agreed to be deported after she and her son were arrested last week in Puerto Vallarta, where they'd fled as prosecutors in Texas investigated whether he had violated his probation for a 2013 drunk-driving car crash that killed four people. She is facing a charge of hindering the apprehension of a felon.

Ethan Couch is notorious for his defense that he was raised in such a privileged way that he was unable to distinguish right from wrong — which his lawyers dubbed "affluenza," a condition which is not recognized by the American Psychiatric Association.