We can quibble about the definition of words, but knowing exactly what botched means, it's my personal opinion that LE botched the sting. Terri allegedly talked to lawn guy many, many months ago, and then in the middle of a missing person's investigation that Terri had, by that point, probably suspected was focused on her, lawn guy shows up with some random guy and starts hounding her for $10,000. She didn't take the bait and called the cops on them.
It is my personal opinion that if LE had irrefutable evidence Terri was involved in Kyron's disappearance, she would've been arrested and Kaine would've left her and taken baby K sooner. LE openly states they have NO evidence a murder has taken place, which means they have no evidence Terri was involved in Kyron's murder. The questionnaire and DY's repeated pleas for Terri to cooperate tell me that LE has little in the way of proof against Terri. IMHO, they still don't know how Kyron was taken from the school and they certainly don't know where.