This is horrible but I feel like I'm in a nightmare

My verbally and emotionally abusive, manipualtive, controlling mother is looking at properties in my town! The town my husband and I moved to to get away from her. Yesterday she called it filthy, and said she was glad I had a husband home in the last neighborhood we lived in. We literally live in one of the highest income counties in the US.. it has also been ranked one of the top cities to live in, and our nextdoor neighbor who is a cop said cops down here are bored. I can't sleep. I feel like I will fail my son by letting her close to us becuase she makes me a basket case. My husband won't let her around if he isn't around because he doesn't trust her around our son. My life is about to get really freaking complicated... 😣😧😖