What the Cullen family didn't know was that Alice could remember everything from before she was turned. She wasn't sent to the asylum, she went willingly. If you had a vampire sitting outside your window every night whispering sweet nothings to you, you would think you were going insane wouldn't you? Her visions didn't get her there; no it was her rambling of an angel called James sweeping her away.
When that stupid asylum working vampire changed her, he robbed James of the chance he had been waiting for to show her that he loved her
But then she found Jasper.