Re: Shared Fence Height
Your neighbor's contract should state what she was paying for. Does it specify a height? Did either the contractor or your neighbor represent to you that the height of the new fence would be the same as the height of the old fence, or is that something you inferred? I'm not sure if you would have standing to go directly after the contractor because the contract was with the neighbor. I don't know how or if that would change if you ponied up half of the cost to her.
The varying fence height seems strange. Is that as measued from the ground at the fence to the top of the fence, or is it as measured from the ground a little ways onto your property to the top of the fence?
If the contractor made a representation to you about the fence height being at or near 6', or if the installation seems shoddy in some way (varying height measured AT the fence, of a fence not designed to vary in height maight be an indication of poor installation), you may be able to file a complaint with the State Contractors' Board. You don't need privity of contract to file such a complaint, you only need to have been adversely affected by the contractors work in some way and show some evidence that the contractor was incompetent or negligent in some way. The agency's investigators will take it from there. Contractors generally take these complaints quite seriously, and if there is any shortcomings in their work, they often become much more willing to rectify the matter when there is a complaint or threat of a complaint to the Board.
I'm a surveyor, not your surveyor & not an attorney.
Advice is general survey, not legal. Hire a local professional for specific advice.