Hello and thanks for using Just Answer.
My name is ***** ***** am happy to assist you with your enquiry.
Whenever someones sells a property, there is a standard Property Information Form which their Solicitor will ask them they to complete. one of the questions on this Form is "are you aware of any disputed concerning the property?". If the Seller lies on the Form, they are liable to be sued by their Buyer for any false information provided.
Therefore, as you have raised this issue with your neighbour, she should either rectify the problem or at least notify her Buyer, as and when one is found.
I would therefore suggest you do the following-
Write another letter asking her to rectify the damage as well as explaining that if she does not, that no doubt she will dsclose to her Buyer that there is an ongoing dispute with you.
Please also send a copy of the letter to her Estate Agents. They are both, therefore, on notice that matters need to be remedied or notice given to her buyer. Any Buyer is unlikely to wish to proceed where there is an ongoing dispute with the property, so normally this would force the guilty party to put right the damage!
I hope this assists and sets out the legal position.