LaBrie claimed in probate court documents that Fraser, the boy's father, chronically missed visits with his son and did not have contact with his school or doctors during the boy's chemotherapy.
"No assistance with care," she wrote in documents filed in April 2007.
LaBrie broke her silence for the first time in July 2009 after she pleaded not guilty to the charges.
"I'm definitely not a monster," Kristen LaBrie said in an exclusive interview with ABC News' Boston affiliate NewsCenter 5 in 2009.
"The people that love me and care about me, they know," LaBrie said in the interview. "I don't think that cases are tried in the court of public opinion. The people that don't know me are the ones that are saying these brutal, vicious things."
Referring to her son Jeremy's battle with cancer, LeBrie said, "We fought together, me and Jeremy."
When asked if she had done everything possible to save her son's life, LaBrie declined to comment.
"I'm not going to answer that question," she said. "I think my story will come out at trial."