However, I also think Ingmar grabbed her when she was headed home.
And he tied her hands before covering the body?
I don't believe Chandra had a chance to be headed home. Whoever lured her out of her apartment and took her to Rock Creek Park or whatever the first distanation was, did it with the intention that Chandra would never return.
The bosy was found about a mile north of Klingle mansion, Levy lived a mile or two SSE of the mansion.
But didn't the dogs [when they were first trying to track Chandra's whereabouts] lose the scenet at the end of the sidewalk? Indicating she had gotten into a vehicle at that point?
However, I also think Ingmar grabbed her when she was headed home.
I think you have the most accurate theory I've read yet about what happened.