Good story. Abduction and chase of Emily are done quite well. Her panic and escape are depicted with clarity.You have written the string events taking place from Emily's point of view and so we do not get information regarding the whereabouts of the villains.
The frame of the story is divided into sections and time factor is highlighted. Emily appears quite brave and agile. For all her efforts she gets caught in the end. I feel it is bit unfair after spending a night in the tree branches and a lot of worry and tension.
I suggest there should be a way for her to get out of the clutches of these two abductors. You could introduce a change in the string of events by showing an escape route via a rescuer in the form of a neighbor, a classmate or a parent who crosses her way and gives a lift back to her home or something similar. It becomes a bit monotonous if you keep her on the run all the time without change in the scheme of events. The plot is getting thinner while the dictum is for it to get thicker.

Write on!