The mother of Conrad Roy III, who died by suicide after his teen girlfriend urged him in texts and phone calls to kill himself, says she doesn’t give any thought to the fact that Michelle Carter will serve less than the 15 months to which she was sentenced for involuntary manslaughter.

“I don’t think about her,” Lynn Roy tells Dr. Mehmet Oz for an episode of The Dr. Oz Show to be broadcast Thursday. “It is what it is. You know, I don’t think about her at all.”