geraldine jones charged with murder , kidnapping , criminal confinement .
gary , indiana , woman , 36 , charged in death of samantha fleming , 23 .
posed as a social worker to lure fleming and her baby from their home .
had called the victim 's mother and lied to her to get information .
allegedly stabbed fleming to death and hid body in a closet .
jones had faked a pregnancy and planned to claim the baby girl , serenity .
police tracked her to a hospital in texas , where she was visiting her mother .
jones is now awaiting extradition to indiana .