If I were betting, I would say that MW's phone gets a lot of use. Pulling the phone details and applying pressure to MW, via the contacts she made/makes would probably get her to open up even more. LE probably already did this but who knows.
MW is answering questions on her FB page now. I really don't think she had anything to do with BL's disappearance. She seems very open. She is intelligent and I really don't understand how she got mixed up with these other people, unless she just needed a place to live. I like her.