My mom also has the similar case as yours... I am very angry initially, now seeing got so many company make me feel better.. sorry, I mean at least I am not the only one having such kind of mother....
My mom is really very self centre and hurt other by her speech without much caring how others' feeling... she now tried to hurt my baby gal by her sayings too... of which really I can't stand any longer. Even a baby she also says sth bad on her... what can I say.... but when ever you say that she has said such a bad stuff , she will deny and says that she has not said so.... then how???? but her "knife" is really killing me.