The mother of Victoria (Tori) Stafford is shrugging off suggestions from online Facebook pundits who claim she looks like her daughter's suspected abductor.

Tara McDonald told reporters Thursday afternoon that such claims are laughable.

"I say that kind of makes me laugh," she told reporters gathered outside her home in Woodstock, Ont.

"I'm five-foot-nine-and-a-half, I'm 175 pounds, I'm 30 years old and it looks nothing like me. Glasses on, glasses off. Hair up, hair down. It looks nothing like me."

She denied that she was hurt by the online speculations of Facebook users about her eight-year-old daughter's disappearance, but said they should be ashamed of the allegations they are making.

"At the end of the day, I know that I had nothing to do with this," McDonald said. "I am a good mother and either one of my kids will tell you that."

Police say the composite sketch of the mystery woman -- seen walking with the missing schoolgirl on surveillance video -- is based on information from a witness.

Investigators describe the woman as being between 19 to 25 years old, at least 5'1" tall and weighing about 125 pounds. She is believed to wear her long dark hair in a ponytail.

Police have not said how long the sketch has been in their possession.

The mystery woman came to public attention after she was seen on the surveillance video, walking with Tori near her elementary school, on April 8.

The Grade 3 student has not been seen since she left school that day.

While Tori's father, Rodney Stafford, has indicated he believes the mystery woman looks like someone he went to high school with, McDonald said she did not know the person he is referring to.

On Thursday, McDonald also provided some more details about the last day Tori was seen.

Tori's mother said she was expecting her daughter to bring home two friends to watch the movie "High School Musical 3" with her.

Then Tori was supposed to go spend some time with her dad, McDonald said.

McDonald and her two children had only been living at their current address for six days, she said.

Tori's mother has been separated from Stafford for some time and does not live with him.

About an hour after McDonald spoke to reporters, her sister-in-law, Rebecca Stafford, held a news conference at the home of Tori's father.

Rebecca Stafford called on the public to donate their time, rather than their money, to helping find her missing niece.

"We've had a lot of people asking how they can help, where they can donate money. A lot of it is focused around fundraising," she said.

"We've also heard reports that people have been canvassing with jars with Victoria's picture on it, asking for people to donate. Well, no one in our family has spoken with anyone about doing such a thing and we're afraid that people are taking advantage of this for their own personal gain."

Stafford said some parts of the Stafford-McDonald family had been organizing money to set up a trust fund for the Stafford children, but had since received a corporate donation from CAMI Automotive to pay for counselling for the siblings.

She said the Stafford side of the family feels that "anyone wishing to make any kind of contribution would be better to do so in the search for Victoria, because our first priority is to get her home."

The U.S. television show "America's Most Wanted" will be broadcasting a segment about Tori's disappearance on Saturday.

The case has been on the show's website for about a week.

With files from The Canadian Press