It's really a question of what you want to happen? For a lot of people Anna predictably falling into depravity, is the payoff they desire. Now you may not want that, but a lot of people do. And it's been extremely obvious for a long time, that that's where we've been headed. So I don't understand why people are suddenly acting like this wasn't always going to happen, particularly if they subsequently chose for Patrick to stay alive.
When Anna chose not to accept Jim's offer, she was choosing to become Patrick's whore. Jim told her things would get progressively worse for her, if she didn't agree to his plan. So if she doesn't, it's because deep down she's started to enjoy it all too much, and this is an easy way for her to give in to her dark side. And that very first night, as Basher is fucking her on the bar counter, she pretty much acknowledges to herself how much she loves being used like that. So if 'everything goes the same way now', it's because that's what she wants and what you and her have chosen to happen.