In an unrelated ease, Fort Worth police said they have little to work with on the case of Melissa Suzanne Highsmith, 21 months, who was apparently kidnaped by a lonely woman posing as a babysitter. Alta Highsmith, 22, the infant’s mother, said she was asleep when a woman posing as a day nursery manager answered an advertisement for a babysitter. The mother’s roommate gave the child to the woman.