Leaving out a lot here, including the part where she finally loses it.
Guess which man?
And then she steals everybody's money and feeds one of the most obnoxious guys his wedding ring.
(Above from issue #3) So Black Canary and Batman parallel each other in a lot of ways their, as Batman says, "Ruthlessness." Also, he just fed a mugger his own teeth.
(Above from #6)
(# 7) These issues are collected in All-Star Batman and Robin, Vol 1.