I thought it was pretty obvious that the mortician kidnapped (or perhaps rescued) Beth. I don't think the house was a "trap" - more likely it was unattended while the mortician was out gathering supplies. It's a complete mystery though if the mortician is a psycho who snatched Beth, or if he rolled up, saw Beth running for her life, and opened the door so she could jump in the car to escape (dropping her pack in the process).
My feeling is that Beth was taken, not rescued. If she were merely rescued, it would make sense that she would tell the driver that she is with Daryl and needs to go back for him. That car pulled out pretty fast.....
Anyone have a list of people who HAVEN'T seen the map to Terminus? The Rick/Carl/Michonne trio is on the way, as is Maggie/Sasha/Bob. Glenn saw the sign too and I assume GI Joe and Mr. Mullet and crew are behind him... so that leaves Carol's group and Beth and Daryl.
Carol/Tyreese and the girls saw the sign and are on their way to Terminus. I think the only ones who are not headed there are Daryl and Beth.