The article I read was an interview w/her and her father there together. It states she went there at 7 a.m. I think though that you are correct in that it makes people wonder, especially after a second article states her saying something kind of different, and "the mystery couple" was introduced as being with her as well. I'm sure "tmc" don't really want the publicity but they too stumbled into a horrible scene and are part of it. I'm not saying BJM did it, only that things don't quite add up, so, I think she knows far more than she's letting on since she was on those grounds, and cleaned that trailer regularly, and KR's too.
I agree that BJM knows more than she's said to media. That's probably true for most of them.