According to court documents, Brady told police she believed Rehma was tired and put her in her crib. When she went into the bedroom about three hours later, she noticed that "Rehma was 'clenching her fists and her arms and legs were stiff,'" according to police.
Brady said she got a wet cloth and put in on Rehma's head. Around that time the baby's mother returned home and called 911, according to police.
Immigration officials said Brady was in the country illegally after arriving from Ireland in 2002 under a tourist program. She was only authorized to stay 90 days.
Court records indicate Brady was previously charged with assault and had two restraining orders taken out against her.
Last year, a Dorchester woman got a restraining order against Brady after she said Brady harassed her by posting a message on a parenting website saying she saw the woman abusing kids on a playground.
In 2005, a former boyfriend got a restraining order after he said Brady assaulted him in a bar for talking to another woman.
In 2007, Brady and her roommate were both charged with assaulting each other and leaving bite marks on one another. The charges were dropped.
Thomas Collins, who has lived above Brady in a two-family home in Quincy for the last six years, said he has had numerous arguments with her over minor things such as use of the yard and an off-street parking space.
"She would literally get right in my face. She weighs probably about 95 pounds at the most ... and she would get right in my face, pointing in my face and swearing," Collins said.
"She would just go off the hinges, just ballistic, at a moment's notice."