Her call was not recorded and exactly when did she come forward with her information--about one month after the event happened and after the release of the 911 calls, which raises some questions in terms of what was actually said.
You might ask yourself why they didn't release the recordings nearly a month earlier.
Regarding "stand your own ground' law, you addressed that law as it might affect Zimmerman's claim ~ but Martin has a claim as well. He didn't provide the cops with a statement. He's dead.