(CNN) -- The mother of an 11-year-old boy who hanged himself after allegedly being bullied at a Georgia school says her daughter also has been a victim of taunting. 

Masika Bermudez-Carrasquillo, who Friday asked the White House for help in a campaign to end school bullying, said her daughter, 12, was also recently harassed by a boy who kept referring to her dead brother. 

The boy was disciplined but still taunted the girl before he was suspended and his mother withdrew him from a middle school, she said. 

Since then, the boy's mom has failed to meet with her, Bermudez said. "I guess she doesn't care." 

The mother, who wrote a letter to President Barack Obama about bullying, held a news conference Friday to ask for help. 

Jaheem Herrera was found dead in his closet in April. 

"Til this day, I live with that memory of seeing my son hanging in the closet; my daughters are so hurt too," Bermudez wrote in the letter. 

Bermudez told CNN that Jaheem, a fifth-grader, had been complaining about bullying at Dunaire Elementary School in DeKalb County. Bermudez said that at the time, she did not know that the bullying had gotten so bad. Friday, she indicated Jaheem once passed out after boys put him in a sleeper hold at the school. 

Administrators and others won't take responsibility for this and other incidents at the school, she said. 

"I feel like I failed him," Bermudez said of Jaheem. "I can't get justice. A year has passed, and they keep denying it." 
Where did he go to school?
complaining about bullying at Dunaire Elementary School in DeKalb County