DALLAS -- The mother accused of abandoning her 12-year-old son for 20 hours at the Dallas/Fort Worth International Airport said she was compelled to do "God's work."

Yolanda Munoz, 46, said she has been confused ever since her arrest Saturday morning.

"I'm not even sure how long I've been here," she said Monday.

Munoz said she can't recall the day of the week, and can barely recollect landing at DFW Airport.

On Friday, she and her son, Brandon Newberg, arrived at DFW Airport. They were halfway through a trip heading home to San Jose, Calif. when she said God made a plan for her.

"My plan was to do God's work," she said. "And at that moment ... it just intuitively came to me."

Munoz said she invited her son to work on the plan and doesn't understand why people think she abandoned him.

"No, I was there," she replied when asked if she walked away from her son. "I was there at the airport for him. I was there spiritually for him the whole time."

While Munoz said she may have not been there physically, she said she was with her son spiritually.

"The spiritual is much stronger than the physical," she said. "[A] spiritual level is much stronger than any other level,"

Munoz said she could not recall leaving or returning to the airport, where she was taken into custody Saturday.

She was given a psychiatric evaluation at Parkland Memorial Hospital and later charged with abandoning or endangering a child, a third-degree felony.

Her son is in the care of relatives.