I don't doubt that Terri didn't imagine the disappearance of a child from school would generate a lot of news, I think she thought she had her plan so cleverly constructed that she would never be a suspect, she would be someone that everyone had lots of sympathy for, etc. She'd never be polygraphed or questioned by LE, just maybe interviewed and have appearances at pressers where she would follow Desiree's lead, and wipe her nose with a tissue and try to look upset, cling to Kaine, cling to Desiree....