Devastating 911 call by the teacher witness in the Zimmerman shooting

This is the female teacher witness. My heart goes out to her and I found this very hard to listen to and paused several times during playback.

Right before this call she heard Trayvon crying out for help and then sees him laying dead on the ground as she talks with 911:

http://www.sanfordfl.gov/investigation/911/call7.wav

She would seem to be one of the witnesses that police encouraged to say that she heard ZIMMERMAN cry for help. This tape and her background as teacher make it clear that she knows exactly which person was crying out.