The point is she had dealings with her ex for years and it followed her to her future. An ex who had a rap sheet with drug related crimes. Hell, she once bought a rental car for him years ago which ended up with a dead body in the trunk.
You have an extensive long lasting association with drug dealers and the like, you're going to be subjected to all sorts of things. Be it investigations, raids, getting violated by some sort of rival dealer, etc.
If she never had an infatuation for a drug dealer, she never would have ended up getting raided that night and losing her life. It's a tragedy, yes, but, if she never had decided to deal with a drug dealer she never would have been in that situation to begin with. It was a domino effect that followed her.