My new neighbors are already rude to me and I haven't moved in?

I bought a house that went through foreclosure and the tree is all over the house so I was trimming it down.. my neighbor comes over and tells me to stop cutting on the tree and that it's wrong to do that.. I simply stated the tree will live through it and that I'm trying to keep it from destroying the house I just bought.. I have maybe a 2 minute conversation with her and she started telling me that I better not be noisy, and not park on the street and all the things she will call the police for.. what should I do? I feel like she already wants my life to be hell