The mother of a 22-month-old Cobb toddler who died after being left in a hot car for seven hours on a 90-degree day in June passed a polygraph test, unidentified sources told ABC News.

Fox 5 Atlanta responded to that report by tweeting that the polygraph was administered by Leanna Harris’ lawyer rather than by police.

In an exclusive interview Monday morning with Good Morning America, friend Angie Bond said Harris "had absolutely nothing to do with the accident." The mother has not been charged in the June 18 death of Cooper Harris.

“She had nothing to hide,” said Bond, Harris’ best friend of 15 years. ” … She loves her little boy. She misses her little boy desperately. And that will never change.”

She talked about Ross Harris, the man who prosecutors allege purposely left the couple's son in the back of his SUV outside his office while texting lewd pictures of himself to other women. A Cobb grand jury this month indicted Ross Harris on malice murder as well as seven other felonies.

“He absolutely adored Cooper,” Bond said. “He was a very hands-on father. Always playing with him.”

She acknowledged that Leanna and Ross Harris’ marriage was not perfect.

“It’s been rocky,” Bond said. “But through it all, they always wanted to work through things.”

Bond also addressed comments attributed to Leanna Harris by investigators, including testimony by Cobb police Det. Phil Stoddard that, when Harris was reunited with her husband after learning he had been charged with murder, she asked him, “Did you say too much?”

“She was just saying, ‘Did you run your mouth? Did you talk so much it makes you look guilty?’” Bond said. “He was definitely a talker.”

Leanna Harris has never doubted Ross Harris’ innocence or been angry with him about Cooper’s death, Bond said.

“She knows how much Ross loved Cooper,” she said.

Ross Harris is expected in court later this week.