The relationship between a woman and her mother-in-law has a bad name in general. While there are some exceptions, in quite a few cases, there are evil mothers-in-law who make the lives of their sons’ wives hell!
Just take the example of Reddit user Sea-Purchase-6547, whose mother-in-law never treated her right, even claiming she was not family when she found out that there was going to be a divorce. However, when she needed a place to stay after a medical procedure, the woman assumed that the poster would let her stay in her house. Drama ensued after she refused.
More info: Reddit