I always felt like Candice's past was a little "checkered", and that due to that, LE just treated her disappearance as if she was likely to have just taken off. I would have to look back, but what I remember specifically is that she did not have custody of her child but her Facebook was full of mentions of her wanting or trying to get him back. No judgement here at all, just what I always thought was behind the apparent lack of serious concern on LE's part.
FWIW, I always thought her disappearance was related to her pregnancy and that the night she disappeared that she was lured out to talk to someone. Eerily similar to Morgan Martin's case, with the exception that they know for sure MM left her house to talk with her bf.