we've been advised to avoid contact entirely- even avoiding greetings.
Was that the police? We had that. It's good advice. They were sympathetic to our plight though and had a word with her, which stopped some of it. Like you, we got CCTV after damage too. When we informed her of it, she complained about it
but her unlovely presence and the damage stopped, which was the main thing.
Among her many crimes against us was a libellous email to us, copying in all our neighbours. She sent it from her husband's extremely prestigious, world renowned work address, no doubt intending to impress and intimidate. At the time, we sent a mild letter asking her to desist, and she sent back snarky abuse.
I hugged that email to my heart and when it was all over, I forwarded it to his workplace to report abuse of their email system and good name.
They took it very seriously and though they didn't say anything more than it had been dealt with appropriately, and I know he didn't lose his job, I'm pretty sure that for a while he was terrified he was going to and got a severe telling off and a black mark on his record.