The guiding principle is that we each take responsibility for ourselves. With that in mind, who is there to allow or disallow abortion? If you wish to abort, it is for you to decide.

Majority rule can only arise when people stop taking responsibility for themselves, and defer to an outside authority.

If the community begins "exercising it's will" as you say, then it is no longer anarchy. That's what makes it an ideal, not a state. It requires a continued effort on the part of all participants to adhere to the principles.