White said Perry told her that Denison asked to pick the boys up to be with Alton on his birthday.
“She was apparently very convincing,” White said.
Denison also had a 13-year-year-old son and, in her suicide note, she said in part that God was watching over him on Tuesday, White said.
In Facebook postings late Tuesday and Wednesday morning, Brenda Perry thanked people for their prayers and said she loved her sons.
“God (has) two beautiful angels helping him now,” the postings said. “My boys are in an amazing place we got a few great angels watching over us. love you Ashton and alton.”
On Monday she wrote: “So excited making mini cupcakes and play dough for Altons day tomorrow can't believe 2 years old already. So blessed”
A man who answered the door at the couple's home on Wednesday declined to comment to an Associated Press reporter. A man at the address listed for Denison said the family is asking for people to keep their distance.
Denison was armed with a gun when she left her home Tuesday afternoon and had permission to pick up the boys from daycare, state police spokesman Lt. J. Paul Vance said.
The bodies were found at about 9:30 p.m. Tuesday, about two hours after state police issued a statewide Amber Alert for Denison and the boys.
Salaun, the daycare center director, said both children were very happy. Alton was always laughing and smiling was nicknamed “the greeter” because he always went to see visitors at the door while other children hung back.
“He would never get close, but he would come right up and look at you like, `Hey, look at me,“' she said. “He was definitely a personality in the program.”
Denison had two convictions for minor driving offenses, said Peggy Muckle, a clerk at New London Superior Court. She was fined $35 in 2003 for following too closely and, in 2004, she pleaded guilty to reckless driving but a judge did not require her to pay the $100 fine.