Well, it seems to me that since there is more going on here, such as your daughter's aspergers and the biting issue, I don't think you can just make her go "cold turkey". The fact that she's biting herself to the point of drawing blood, is not a typical reaction. I don't think a child would do this to exhibit control over you, she's got more going on than just attachment to the binky. I would work on trying to establish another comfort item, like a doll or a blanket in addition to the pacifer. In fact, I'd remove focus on taking the pacifier away at all, until you can work to find a replacement comfort item.
Also, while I think most dentists mean well, I do not think you can just take away the pacifier from your child. I know problems with teeth can occur, but I think you should follow advice from a previous post and seek out a pediatric dentist, who may be more sensitive to your child's needs. Also, think about it, she's used this pacifier to comfort herself since birth....it's got to be darn near impossible for her to think about not having it, especially if she's got some sensory processing issues, I can only imagine that it is a terrifying idea to her.
When weaning her off of it, during the day, (I think day and night weaning of paci should be tackled separately)replace it with a biting toy or item and reward her for not using it, either with a chart, or a special treat or priviledge. Stay positive and reward for small accomplishments. Once she can handle the day with out it and has another comfort item then try the night time.
What we did with our son was promise a big new toy item if he could sleep through the night without his binky. Once he did it, we didn't go back, we had one or two harder nights, but now he's off it completely. I weaned him off around 3 and a half years, which is a lot older than most people recommended, but this was what I thought worked out best for my child.
I wish you the best of luck and please trust your own instincts. You know your child better than anyone else. If she ends up sleeping with a binky until she's six, then so be it. It's not the end of the world.