Agreed with Richiev. It took me some time to understand the premise as well (this is telling…) and it would seem that further explanations are needed for the logic to come through – best to make some significant changes to the concept so this isn’t the case.

The whole taking a bullet and grieving widow aspects are confusing the point. The event that starts her on her journey is the husband’s murder, therefore the logline should start with:
After her husband is murdered…

Then the action she takes is to hunt down the killer, so:
After her husband is murdered, a [good description MC] must hunt down the killer to save her own life.

As it stands now, the MC description is very generic and therefore I don’t know what kind of person she is or what ability she has to survive/catch/figure out who the killer is.