At what point did it get serious and who do you believe notified her?
Before she left for work, she told Stevie he had to be home by 4:30. Terry took Pam to work to start her 5:00 shift, both of them knowing Stevie wasn't home yet.
Terry picked her up at the end of her shift, 9:30pm, and STILL DID NOT tell her about Stevie being missing. He walked into her workplace and made a phone call. She got the news about her missing child from her 4-year old daughter while sitting in the car waiting for Terry.
ETA: Terry finally told her when he came out that he had just filed a police report & Stevie was still missing.
Details here:
http://callahan.8k.com/pdf/pam_hobbs_interview.pdf