The mother of missing 2-year-old Caylee Anthony was named by the lead detective in the investigation a “person of interest.”

Casey Anthony, 22, has so far been held on three smaller charges, including child neglect, making false official statements and obstructing an investigation, but prosecutors said the case was beginning to look like a homicide. Sheriff’s deputies said they still hoped to find the girl alive.

After hearing about the discovery of samples of hair that had length and color similar to Caylee’s in the trunk of a car owned by the Anthony family that was last driven by Casey, Circuit Court Judge Stan Strickland set Casey’s bond at $500,000 Tuesday. Even if the bail is posted, Anthony must wear a GPS tracking device at all times.

Anthony’s attorney said that there was circumstantial evidence of a possible murder, but the evidence was not enough for Casey Anthony to be charged with homicide or kidnapping.

Strickland said he was concerned about the fact that Anthony’s “conduct just hasn’t changed,” and she hadn’t been of help at all during the investigation.

Anthony’s mother, Cindy Anthony, confessed that her daughter had indeed lied to the investigators, but also that she was a good mom, who has her reasons not to tell “the whole story.”

Anthony was arrested on July 16 after police realized that she had not reported her child as missing until a month after the disappearance.