Excellent question!
What I recall reading is that Benjamin Crump took her deposition shortly after the incident, in preparation for ginning up the lynch mob. But, amazingly, the Man didn't talk to her until Corey took over the case. It will be most interesting to see how her account "evolved" between the those two points in time.
"ABC News was there exclusively as the 16-year-old girl told Crump about the last moments of the teenager's life."
"The lawyer said he would give the details of the phone call to the federal investigation."
So it appears that the girl is giving this account to ABCNews and Crump about three weeks after the incident, and that Crump is writing the interview up into a statement to give to investigators.
Of course any ABCNews article cannot be taken as objective, especially by Matt Gutman.
Was this a "reenactment" of an earlier account given to Crump by the girl, or the first time? If it was the former, it is sleazy of ABCNews to suggest otherwise, but then again ABCNews is sleazy.