Hi,
My conclusion is that she was likely taken by someone who knew her from her bfs house and who she had interacted with at least a few times. This person likely knew her well enough to know that she would feel better about leaving the house if she knew the dogs would be fed if she did not return. He knew her well enough to know her routine and when she would be most vulnerable. I imagine this person stalked her, which means he would have had to possess the time to do so. I would guess that he is likely a divorced father, a college student, unemployed, disabled, retired, and/or someone whose profession it is to sit around in a car and wait for something to happen (LE) (no offense).
The absence of a crime scene tells me that his attack was planned out, and that this person is meticulous and organized, and would also lead me to believe that it is probable that he older than college age.
He probably owns a gun.
I believe he probably was knocked on the door while she was doing homework. He lied and said there was something he needed help with (ie. Flat tire). She let him in for a minute. He pulled a gun. She said, ok dont shoot, let me feed the dogs and I will go with you. He follows her downstairs. She feeds dogs. He tells her to get her phone. She gets phone. They get in his vehicle, he tells her to power off the phone, and they leave.
Hopefully she is being held somewhere and she is not dead. If I was LE, I would be looking at divorced dad's who occasionally picked their kids up from daycare, who own guns, and who have large properties with multiple structures on site or second properties where they could hold someone hostage without being discovered.