My neighbour and my cats!

[BigButtons]

I moved into my house in 2023. My neighbour told me immediately that she disliked cats. I had one cat at the time.
he had to be pts in dec 24. In Jan 25 I took in two kittens and then their littermate who had a failed adoption. The cats are now just over a year old.
My neighbour hates them being in her garden . They like sitting under her bird feeders. She says it stresses her out and that I should be responsible for my three cats and should not have got three cats.
what am I supposed to do? I can’t stop the cats from roaming.
the cats have to go through her garden to get to the cat flap in my garden- she is end of culdesac and I have no front door cat flap.
i have suggested she puts legal deterents on her fence and have agreed to quick release collars with bells- even though I know it will make little difference.
anyone else have to deal with this?

Hang on - you said they could only access via the neighbour's garden?

All neighbourhood cats can access neighbours garden easily via the front and round the side as a high bank goes from the road to the bottom of her garden.
They just go up the bank and drop down into her garden.
My cats then climb the fence back into my garden and go through the cat flap .
cat proofing the fences with make it harder for them to access my garden from hers via the fence but it will not stop any cats from accessing her garden from the street.