JMO, I definitely am leaning towards the fact that he is hiding, and his family is probably assisting him, or at the least they aren't offering LE any assistance/information whatsoever. I still can't land either way on whether she is willingly with him. She probably is, and my cynicism in humanity leads me to think she probably is willingly aiding and abetting him from being apprehended.
That being said, there's still a part of me that can't discount the possibility that she is being prevented from leaving him or getting away. For every thought of "she's actually helping this asshat AFTER knowing what he's done", there's another fleeting thought of "....but what if he took her phone and he's just lost it, and with the prospect of life in prison looming I worry he may try and take a self harm route and take her with him. If she is actively working against LE, then she should certainly be charged with some form of crime.