Hello, I hope you are well. My name is***** am a solicitor advocate and I will be assisting you with your question today. I am very sorry to hear of the problem you are experiencing and I will do my best to help you with this matter.
From what you have explained here, it would appear that the neighbour is confused regarding the difference between shared and right of access.
As for attaching anything to your property, that is damage and they would be held liable for that damage.
if she has rights of access there is little you can do about that, but attaching items and causing damage to your property you can take action about.
The first thing to do is to send then a cease and desist letter informing them to stop and desist causing damage to your property.
Next, you need to obtain quotes to:repair the damage, you can then send those to the neighbour seeking them to pay to have any damage put right.
If they ignore or fail to do so, then you pr next course of action would be via the courts.
Before doing that, you would need to send the neighbour a letter before claim following the pre action protocol of the civil procedure rules. Once that has taken place, if they still refuse to communicate with you or pay for the damage, then you can commence your case at court.