The she-wolf kills all that approaches her but a magnificent hound will come and chase her back to her origins, Hell.
She-wolf represents the sins of incontinence. Incontinence is the lack of self-restraint. Doing what you want, whenever you want, regardless if it is right or wrong, ever if it harms others as long as you get what you desire.
Dante's purpose in writing Inferno was to compare his journey in the story to what happened to him in real life. He was a famous poet and was very influential. However, political enemies took over and made him go into political exile.
His writings reflected the kinds of people he encountered and the possible consequences of their actions in the afterlife.