I recently moved into a senior apt area.  My nearesr neighbor at first seemed friendly.  She is 85.  I have helped her at times anr brought food. A few months ago she started to seem more distant.  I thought it might be covid, but otbers things turned up.  She didnt like where i parked.  Said that space was for another resident but tenant been gone a year.  We have a issue with snakes here so i called lanlord for help she was upset.  One time she seemed to be talking to them in a childlike way.  I had company one day and she yelled at me and now wants nothing to do with me. She seems to look at me like a enemy or stranger.  She also mentioned one time someone took her flatware.  She has little family. Its upsetting to.me. Now i just say hi and move on. Now uncomfortable here.  She seems very angry. My friends think dementia involvolved.  Any thoughts?