First, while the townspeople were angry at Wanda, they also know she's powerful and fear her. There's no way they would attack her. Also, it's possible they ran away when she said, but once things cleared they came back because of their children and the fact that that's their home.
Second, I believe it's as @Chaos Theory said, this whole process was her cathartically going through the stages of grief. She was the source of the *extra* trauma of losing her children, though they're not really gone it seems.
Someone else mentioned Wanda likely getting that help from Dr Strange and I think