It's doesn't matter that she panicked and fled. Any intelligent person who has killed in self defense with no witnesses should be distrustful of the law.
The prosecution has no theory of a motive. Her self-defense claims may be weak, but in the absence of any motive put forward by the prosecution her claim must be accepted. This is particularly the case since the burdon of proof in this kind of case is supposed to be high.
She has no prior history of violence or criminality.
A fair jury will find her not guilty.