It depends on if you're getting anything out of the friendship or not. Sometimes friendships like that can be mutually symbiotic. As in, they may use you at times, but they also have something to offer you in return.
What you need to do is examine the friendship objectively and see if what you are getting out of it is equal to what you are giving. If it's one-sided, then I would advise you to cut her out of your life, because at that point it's not really a friendship at all. I don't think people with SA should settle for less than great friends just b/c it's a bit harder for us to make them. Esp if she is making you really miserable.
As for how to go about it, don't burn your bridges. I would just slowly cut off contact. That way you leave the door open to future interactions. It's better to not make enemies when you don't need to.
The future is
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, and it's about a hundred feet above the Arby's.