What if you planted a hedge? These are often not subject to fence height rules.

"She also spies on me as much as possible."

Why would she do this? What are you doing that's so interesting that someone would take time to investigate you "as much as possible"?

You probably could build a tall trellis, either attached to your carport or freestanding, between the carport and the fence, that wouldn't be subject to the fence restrictions.

Olychick-

That sounds like a good idea, especially if the OP plants something non-deciduous to grow on it.

Thanks for the ideas, except for Joseph who seems to want me to be to blame for my mentally ill neighbor's abusive behavior. A concrete sidewalk goes along the fence so I can't plant there. I like the trellis idea except that the water can still get through. Maybe just stapling plastic up or some faux plastic plants. Hmmm. Thanks again.

I had a neighbor install a birdhouse with a camera in it facing my property. My wife didn't believe it until I went over and stuck my finger in the hole. He attempted to have me arrested 6 times and lost each. I'm familiar with nutty neighbors.

Y'all wana trade neighbors with me? My neighbors and their kids just come over and have a look around rather than watch from afar. One threathed to sue me because his kid sniffed spray paint he stole from my shop. Another helped himself to my car ramps and didn't return them until I had bought replacements. Offered him a deal since I then owned two sets but he opted to continue borrowing.

Since you do not want to pursue legal remedies(and I understand your reluctance to do so), you will need to be creative. And patient. However, the watering could possibly be detrimental to your property and contacting the local property codes office should be a good idea(depending on how the codes office operates).

Having a complaint on file should also give you some more solid background should the situation escalate.

I'd build a trellis that is adjustable. And one that is solid enough she cannot see through it easily. A basket weave pattern of cedar lathing(thin strips of cedar) on a cedar frame, for instance. Leave three feet open on the bottom and use stainless steel pins(so they do not rust and stain the cedar) to raise and position the top at 8'.

Or, build the trellis supports U shaped(making the trellis move like a window) and simply put 2' removable supports to hold it in the 8' height.

That way, if she complains, and the codes folks come out, you can instantly be compliant by simply lowering the trellis. Plus, you have the prior complaint(and a couple would not hurt) to back up your solution.

Can you just put a "wall" on that side of the carport and close off that side be done with it?

Apply for a variance with the city for a taller fence due to a nosy neighbor. 8 foot fences are not that rare, just deemed 'un-neighborly' in some communities.

HandyMac's idea sounds good too.

A trellis does not have to be open weave. You can put a solid backing on it, making it impossible to see through and impervious to water. Add the lattice portion on your side of the trellis for plants to climb. She sees a solid wood or other material portable wall - you could hang an outdoor bamboo shade on the backside; pretty indestructble by water. I wouldn't go to the trouble to make the trellis adjustable, I'm pretty sure if it's freestanding and not on the property line (or even if it is as long as it's not a fence), that it's not subject to height restrictions. You can attach it to a planter box and place the whole shebang on concrete.

You can also hang a bamboo roller shade on the far side of the carport - they come in different opaqueness.

I think 8 ft fences are allowed in my area, just aren't commonly seen, so you might want to check the code.

a couple more ideas using fabric:

Google images for 'outdoor rollup shade'. I was thinking of this for the side of the carport. They make them in bamboo, plastic weave, vinyl fabric, anything you want. They roll up and down like a shade.