Tonya Couch behind bars in Tarrant County

FORT WORTH, Texas - The mother of the infamous affluenza teen has arrived in North Texas and will spend Thursday night at the Tarrant County Jail.

Tonya Couch arrived on Thursday afternoon at DFW Airport and was taken in a van to the Tarrant County jail, where she was booked. She will be arraigned on Friday on a charge of hindering the apprehension of a felon - her son, Ethan Couch.

Couch was previously in custody in Los Angeles after being deported by Mexican authorities. She dropped her legal fight and agreed to willingly come back to Texas.

Tarrant County Sheriff Dee Anderson said Tonya Couch was "quiet, reserved, respectful" on the ride from DFW to the jail in downtown Fort Worth. Anderson said Tonya said no to any media interviews and only made two requests when she arrived at the jail - a call to her lawyer and something to eat.

Tonya Couch also told the sheriff that she had been treated respectfully by authorities since she was detained and sent back to the United States.

Ethan and Tonya Couch fled the U.S. in mid-December and drove to Mexico when he was under investigation for violating probation, but before a warrant was issued. They were found in Puerto Vallarta in between Christmas and New Year's.

Tonya Couch's attorneys released a statement last week saying she has done nothing illegal.

"While the public may not like what she did, may not agree with what she did, or may have strong feelings against what she did, make no mistake -- Tonya did not violate any law of the State of Texas and she is eager to have her day in court," lawyers Stephanie K. Patten and Steve Gordon said.

Ethan Couch pleaded guilty in juvenile court in 2013 to four counts of intoxication manslaughter and two counts of intoxication assault causing serious bodily injury after a drunk driving wreck killed four and injured others.

He was sentenced to 10 years' probation after a defense expert argued that Couch had been coddled too much by his wealthy parents, a condition the expert called "affluenza." The condition is not recognized as a medical diagnosis by the American Psychiatric Association, and its invocation drew widespread ridicule.

Ethan Couch remains in custody at an immigration detention center in Mexico City after winning a court reprieve that could lead to a weeks- or even months-long legal process in Mexico.

Sheriff Anderson said Thursday, "it's not a question of if he's coming back, it's a question of when he's coming back."

The Associated Press contributed to this report.