This was already discussed.
She lied about some shit about going to the hospital to visit someone. But it's documented she was indeed on the phone with Trayvon before the attack and when he was shot.
She wasn't the entire case anyway. The prosecution really didn't need her to convict Zimmerman.
The fact remains you can't follow someone knowing you're carrying a loaded firearm, get into an altercation and shoot them dead, them claim self-defense.
With the way that the SYG law is written in Florida, you can.
Check this out:
http://www.npr.org/blogs/thetwo-way...judge-decides-fatal-stabbing-was-self-defense
This dude chased down a guy that he saw breaking into his car with a knife and stabbed him to death even though the dude was running away with his back turned to him and was no threat. You can claim self-defense and get out of almost anything.
Here's a story about a crack dealer who used SYG to skate on murder charges for killing two dudes that he had a beef with:
http://www.tampabay.com/news/courts...ound-to-avoid-charges-in-two-killings/1235650
There's a good possibility that Zimmerman gets away with this.