The Board has a fiduciary responsibility to protect the assets of the homeowners. If there is an unresolved difference between neighboring owners, and one of those is a Board member, they are especially responsible to try to reach a compromise fair to all. Should it look as if they are allowing a Board member to trespass on non- community property, they are putting the Condo Association in peril of legal costs and even a judgment against the Association. Their responsibility is to meet with you and let you present your case as plaintiff, and the neighbor a chance to defend her position. The neighbor/Board member should not be allowed in on the deliberations of the Board nor the vote. Before spending money on an attorney, first see how they handle your complaint. Make sure to let them know you expect a hearing and an impartial decision on the complaint. Let them know that you are keeping records and expect a written determination and will consult a lawyer if you suspect that the neighbor/Board member is given preferential treatment. I doubt that anywhere in your CC&R's is a trespass allowance.
I spent 12 years on my Condo Association Board, and we took very seriously our duty to protect the assets of the homeowners. And that means avoiding at all costs any legal costs or lawsuits.