Phew soledad, this sounds like it might well be resolved, a tricky situation.

It appear's that your neighbour is an animal lover, so that is good new's, believe me I can understand what it is like having sleep deprivation for almost a year due to disgusting neighbour's who had parties nearly every night of the week, It almost drove me insane.

I think your approach was sensible, and gosh it is hard to keep kitties from making noise, and you are doing your best, I really hope this all work's out for you , or maybe you will just have to come on back to lil ole NZ lol.

But seriously I hope you can work something out amicable to both parties.