Remember Jessicas Mom said that since she had returned from "safe" house, she really just did not go out much except for work and visiting her friend across the street. The is Charlotte Wilkerson, AKA Auntie Sha-Sha. Auntie, as far as I can tell, is the only person who claimed that JC was going to a party. Auntie may have been a confidante of JC and may have been covering for her real destination. No one else claims to have seen JC at a "party". Did Auntie spill the beans? I do not know, but Auntie had to tell LE SOMETHING because they knew from JC's phone, that she had spoken with Auntie Sha Sha. JMO