The grandmother accused of killing her 2-year-old granddaughter when she allegedly threw her over a Tysons Corner Center walkway earlier this week may have a history of mental illness, her attorney says.

Deputy Public Defender Dawn Butorac says 50-year-old Carmela Dela Rosa's defense is exploring the grandmother's mental health as they prepare for a Jan. 4 preliminary hearing. Dela Rosa is being held without bond.

Police still have no motives.

The granddaughter, Angelyn Ogdoc, died early Tuesday morning as a result of injuries from the fall off an outdoor walkway that connected the mall to the fifth floor of a parking garage.

Her parents, Kat and James Ogdoc, were both 2006 graduates of Bishop Denis J. O'Connell High School in Arlington. Kat is employed at George Mason University as an assistant program coordinator, according to the university's directory. James is a psychology student at the university.

The family lives in the Pimmit Hills area of Falls Church.

Family and friends have set up a Chip-In Fund for the "precious little one" who they say was always smiling. So far, the site has raised $697 for the family, but friends say they wish there was more they could do.

"I wish I can give them so much more than money has to offer," wrote Alexandra Hermesman. "I hope that this helps ease the pain a little bit, but and they can find comfort with the help of their friends and faith in God. God bless Angelyn, Kat, James, and the Ogdoc and DelaRosa families."

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UPDATE 12/1/10

Dela Rosa is being held without bond, according to the Office of the Commonwealth's Attorney. The Associated Press reported that Deputy Public Defender Dawn Butorac will represent Dela Rosa. She declined to comment on the case.

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UPDATE 11/30/10 (2:09 p.m.)

Neighbors of Carmela Dela Rosa and her 2-year-old granddaughter, Angelyn Ogdoc, are trying to piece together  what exactly happened last night at Tysons Corner Center, when Dela Rosa allegedly threw Ogdoc over the edge of a six-story outdoor walkway.

Dela Rosa is now charged with murder, said Fairfax County Police spokeswoman Tawny Wright.

Dela Rosa kept to herself but was "always friendly," said Russell Smith, who lives in the house next to Dela Rosa with his father.

He said he saw Angelyn, who had shoulder-length black hair, with Dela Rosa three or four times a week.

"She was always smiling, always happy," he said of the girl.

Smith said other family members were often over Dela Rosa's house as well, and that Dela Rosa would organize several neighborhood gatherings, like cookouts, each year.

Family members and friends arrived at the white, two-story Falls Church home of Ogdoc throughout the morning and in the early afternoon. Nobody in the home answered the door or responded for requests for comment.

Bill and Lynne Kreher, of Falls Church, have walked the dog of their friend -- Ogdoc's neighbor-- every day for about a year, and have never seen Ogdoc playing out in the yard of the home.

But as grandparents themselves, they are shocked that a "grandmother would pick up a toddler and throw them over a railing," Lynne said.

"They have the death of a child and no explanation, and a family member charged," Bill said. 'That's a lot to deal with, especially just weeks before the holiday."

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UPDATE (12:55 p.m.): Dela Rosa is now charged with murder.

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A two-year-old child died at Inova Fairfax Hospital this morning after a family member allegedly threw her off a sixth-story outdoor walkway at Tysons Corner Center.

Police say that Carmela Dela Rosa, of 3146 Ellenwood Drive, Fairfax, was walking to a parking garage with the child, Angelyn Ogdoc, of Falls Church, and other family members when Dela Rosa allegedly threw Ogdoc over the edge of the walkway.

Firefighters were called to the scene around 7:10 p.m. and transported Ogdoc to Inova Fairfax Hospital, where she was in life-threatening condition until she died around 4:30 a.m.

Dela Rosa was charged with aggravated malicious wounding and was taken to the Fairfax County Adult Detention Center. Police say criminal charges could be amended to murder.

Check Vienna Patch for updates to this story.