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Someone can always file a lawsuit, even over something petty, but it does not mean they will win the lawsuit. Also, if there was no justifiable reason for bringing a lawsuit, the person can be sanctioned in some instances. But generally, for these sorts of things, you cannot be successfully sued unless your plants cause actual damage to her property. It is not enough that it just grows to her side and she cuts them. You cannot be successfully sued for that. She is allowed to cut any foliage that goes on to her property though.
It is technically a trespass if she reaches over into your yard and cuts your trees, but you would have the same problem as far as taking her to court for that. You would have to sustain actual damages to do that and her cutting foliage is likely not sufficient damages for doing so. If she destroyed a whole garden and you can prove it, that might be worth taking her to court over but it sounds like quite a hassle. I think you are best to rely on using the police.
Sounds like a very frustrating problem, good luck.
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