LE seems to accept Gma's story that she came by that night between 7 and 8. I'm sure they would have talked to her the night Haleigh went missing, and the first thing they will ask is, when was the last time you saw her? Just because we didn't hear about this until 9 days later doesn't mean LE didn't know about it the first day. It just didn't get told to NG right away. Imagine that.
I don't rely on Nancy Grace for any of my information. I'm going by Misty's statements to the media as she repeatedly told her story, start to finish and never once mentioned GGMS coming by the mobile home that night. Well, that is until GGMS herself came out with that bit of information.