ORLANDO, Fla. -- Threats from the public, including extortion, are targeting the family of a missing Orlando girl as the case continues to grab national attention.

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IMAGES: Missing Caylee Anthony Photos
IMAGES: Photos Of Casey Anthony Surface

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Cindy Anthony, the grandmother of missing Caylee, said she has received the threats through e-mails, letters and phone calls.

The incidents have been forwarded to the authorities for investigation, Local 6 has learned.

Charges Are 'Good Thing'

Meanwhile, the state attorney's office filed formal charges of felony child neglect and making a false report to law enforcement authorities against Casey Anthony, 22, in connection with the disappearance of her daughter.

The false information concerned the date and location where Casey Anthony alleged that she saw Caylee.

Cindy Anthony said she was not surprised by the charges.

"Today is actually a very hopeful day," Casey's mother, Cindy, said. "I just found out that they did charge (Casey) formally today which is a good thing because look what they charged her with. To me that is actually almost a victory for the home team today because they obviously have not found anything."

Anthony said life is hard without her missing granddaughter.

"Every moment that passes, I die a little bit inside every day not having her," Cindy Anthony. "She is a part of me and without her I feel incomplete."

Anthony said her daughter has her reasons for not opening up to law enforcement about the location of her granddaughter and she understands.

"We bring Caylee and everybody is going to know and Casey is not going to be this monster that everybody has painted her out to be," Cindy Anthony said.

Baby Sitter Remains Mystery

Deputies are still trying to figure out exactly when Caylee vanished and are not ruling out that her mother, Casey, may have posed as the mystery baby sitter no one can find.

Casey Anthony maintains the last time she saw her daughter was the day she dropped her off with a woman named Zenaida Gonzalez at the Sawgrass Apartments in Orlando.

According to the original arrest report from July 15, someone by the name of Zenaida Gonzalez looked at an apartment on April 17, 2008.

Local 6 has confirmed with apartment managers that the incident didn't happen in April but on June 17.

The date is important because Caylee was last seen two days before on June 15, Local 6's Lauren Rowe said.

Sawgrass managers said on June 17, someone came to inquire about an apartment.

Investigators said the person filled-out a guest card using the name Zenaida Gonzalez and the person who wrote it had sloppy handwriting.

Someone misread the date when filing out an original arrest record, Local 6 reported.

Sources told Local 6 that when apartment managers tried to follow up with the woman after June 25, the phone number she gave was no longer valid.

And the apartment where Anthony said she left Caylee had been vacant for about six months, Local 6 has learned.

Investigators said they located a woman named Zenaida Gonzales but she said she'd never heard of Caylee or Casey.

Child's Grandmother Cancels Meeting

Tuesday, Cindy Anthony canceled a scheduled meeting with her daughter at the Orange County Jail.

"As much as I wanted to see Casey today and visit with her, I couldn't," Cindy Anthony said. "I did get to meet with her attorney and he is going to be able to speak with her in private with my thoughts and the things that I want to talk to her about."

Anthony said her granddaughter's safety may be in jeopardy if conversations between her and her daughter Casey are open to public scrutiny.

"I had all of these mixed feeling about should I go or shouldn't I go," Cindy Anthony said. "Bottom line was that I made the decision this morning that I wasn't going to go."

Cindy and her husband, George Anthony, met with investigators Monday concerning the search for Caylee.

"It was a meeting at our request just to touch base with them and see where we are all at," Cindy Anthony said.

No information was released about the private meeting but detectives continue to deny the existence of a mysterious baby sitter who Casey Anthony has claimed was last with her daughter.

Also, DNA results concerning a mysterious stain and hair samples from Casey Anthony's car are due any day this week, Local 6 has learned.

A national search for the child continues.

Watch Local 6 News for more on this story.