I was going to reply yesterday, but I broke our keyboard (
), so sorry for the late reply.
I just wanted to add make sure you are your daughters vocal advocate in front of your mil when she comes out with comments like that. let your daughter hear you say " that is not appropriate and not true, she is a delightful (insert appropariate opposite comment) girl, and I would ask you not to speak so rudely to her. She needs you to demonstrate assertive behaviour so that she knows you dont condone the comments, and show her how to deal with such horrible behaviour in the future (from mil or others when she grows us)
Clearly this is not on, your mil needs you and your husband to firmly put her in place, tell her such comments are not on, and that outsiders (the teacher) have commented on her inappropriate behaviour. (Which shows how truly horrible she must be, an objective person telling you this is a huge warning flag not to be ingnored) I would have her spend alone time with my child over my dead body. the damage that can be done to fragile developing ego''s at this age are huge. She must have serious issues. EVRYTIME she steps out of line you must publicly and instantly pull her up eg such comments are not true nor appropriate, please do not speak like that to our daughter.
And as Whitby suggested lots of positve reinforcemnt, tell her she is beautifu, smart, special, etc etc a million times a day, kiss her and cuddle her and show her your love. I would also find some age appropariate books about feelings, and bullies and read them to her and get some discussion going around that to help her understand grandma and others like that, have issues and it is not her fault or the truth.
good luck, what a horrible situation to be in.

I just wanted to add make sure you are your daughters vocal advocate in front of your mil when she comes out with comments like that. let your daughter hear you say " that is not appropriate and not true, she is a delightful (insert appropariate opposite comment) girl, and I would ask you not to speak so rudely to her. She needs you to demonstrate assertive behaviour so that she knows you dont condone the comments, and show her how to deal with such horrible behaviour in the future (from mil or others when she grows us)
Clearly this is not on, your mil needs you and your husband to firmly put her in place, tell her such comments are not on, and that outsiders (the teacher) have commented on her inappropriate behaviour. (Which shows how truly horrible she must be, an objective person telling you this is a huge warning flag not to be ingnored) I would have her spend alone time with my child over my dead body. the damage that can be done to fragile developing ego''s at this age are huge. She must have serious issues. EVRYTIME she steps out of line you must publicly and instantly pull her up eg such comments are not true nor appropriate, please do not speak like that to our daughter.
And as Whitby suggested lots of positve reinforcemnt, tell her she is beautifu, smart, special, etc etc a million times a day, kiss her and cuddle her and show her your love. I would also find some age appropariate books about feelings, and bullies and read them to her and get some discussion going around that to help her understand grandma and others like that, have issues and it is not her fault or the truth.
good luck, what a horrible situation to be in.