Except, let's look at "how" you helped her.
Let's say it saves her life, ex shows up and she kills him defending herself. Good, right?
Well except, she got an ilegal silencer to do this, (can you say premeditated murder?), now, how does she explain to the cops?
What would have been a simple (well simpler) case of self-defense just became an even worse nightmare.
A presecutor would have a field day with this one.
Or are you advocating that she kill him and hide the body?
Basically your help may have cost her big time.
You really aren't good at thinking things through...beyond a criminal's perspective.