Tressa says that she that the supposed grandmother of "Dylan" was aware that Beth was coming to Hodgenville and would be allowed to stay at their home.
"I'm starting to have my doubts. I'm really scared. I don't know what type of situation she would have found herself in," she said.
Tressa also says that she was shocked by her daughter's elaborate plan of stealing the ATM card and changing the car's plates.
"I don't know if my daughter would have been witty enough to switch the plate on the car," she said. "That had to be coerced. I don't believe that my daughter would have been able to think of that on her own. Not at 13 years old."
Robinson said she had no idea what her daughter was doing while she played on her Xbox in her bedroom. Call of Duty is rated "Mature," meaning it is suitable for persons ages 17 and older.
"You buy the game systems for your children, but I don't play, I don't understand how they work," she said. "I knew it had Internet access and that she could communicate. I didn't know these things allowed you to email and have conversations.
"When I was able to see the messages I was like, 'Oh no.' I became very concerned and very educated very quickly," she added.
Robinson said her daughter's Xbox will now be placed in a central location in the house and she urges other parents to do the same. The girl will not be allowed to use the gaming system and will no longer be able to use her Facebook account.
She said that in addition to a yet-to-be-determined punishment, they will also be seeking counseling for their daughter.
"It's going to be a little more in depth," she said. "She has to understand the dangers that she put herself in and what she put our family through."
Police in Nashville were unavailable to comment on the case, but Tressa Robinson told ABC News that no charges will be filed against Beth.
A sheriff in Harris County, where the family lives, will be speaking with them on Monday about possible fines or charges in the case.