I agree with terracotta's scenario and her hope that LE is building a case. I wonder if Bella was inside of the house during the attack and let out later? I wonder if LE found any fresh scratch marks on the inside of the door to the home? I remember that a shirt that the daughters said was...
http://baltimore.cbslocal.com/2013/03/10/hundreds-join-search-for-missing-stevensville-woman/
I found the tv station website where a commenter left the little blurb about R having a "lover". I know it is just a comment left by "anyone", and I know it doesn't mean it is was true by any means...
Early on in the case, someone had responded on a newspaper or tv news website a quick post saying something like, "What about R's boyfriend?" I have seen nothing else about this and cannot now find where I saw this, but her having a love interest might add another dimension to the case. Also...