Perhaps during nap time you can shift her to a room further away, close the door and turn on the air con, hopefully this can help to minimize the noise? I think kids at this age (2-4) all behaves like that because they are more expressive and independent, give and take, it's part of the growing phase all child will go through. If it really happens too late in the night, perhaps can just go over and ask nicely if they can keep it down. Sometimes people don't realized the noise can travel so far.
It's important to try to get along with your neighbours, so maybe the first thing to do is visit them and explain your dilemma in a friendly way. They may have no idea of your needs, and you may even build a stronger friendship with them out if it, which im sure would be great!
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I would suggest turning on the aircon or play some lullaby. Can't help as it's kids also. Our kids may behave like these when they are older
Why not try playing some white noise. That will help to cover up some of the noises by the neighbour kids.
How about trying to make friends with them first out of courteosy. Then from there highlight it.