My motherinlaw, i did everything, to please her, n then to please god, what else can i do now?

my mother in law is a very strong woman....she thinks she is...she wont let us enter kitchen without her permission...she wants to cook everytime...but then complain as well tht she gets tired....she never encourages us cooking me and my other sister in law, whenever i cook something, everyone will comment she ll never admit its nice...she ll make all sort of faces as if its killing her to eat every bite...its so discouraging...esp when i have newly started cooking...i need motivation from the master chef which i really think she is...but neverrrrrrrrr.....she ll ask me to make the same dish twice a week BECAUSE UR FATHER IN LAW wants it but will never say she liked it or not. shes bit intimidated by my sis in law whos married in the family for 16 years now....she ll tell her ooo thts nice even if its not...shes scared she ll smile at her even if sis in law is upset with her. with me on the other hand , she ll make faces....i tried everything , i have left my house, living with in laws , looking after bro in laws kids while their mum is away...feeding them bathing them, playing with them, putting them to bed, giving them tuitions everything a mum would do...besides studying for my exams which are in dec. looking after the house, cleaning it...because their house is never clean...never tidy, junk mails everywhere, silly lottery forms....i help them to keep things properly...n all tht...i dont tell them or just talk about house being messy...i help them cleaning without making it obvious...i do my best...she would not tell me until 3 in the afternoon tht i ll b cooking tomorrow...kids arrive home at 3 30 , i have to studying in advance if i m cooking, n all so i can prepare myself, i was like okay, i ll cook...i dont mind coooking...but after 30 mins, shes like ohhh we dont have this we dont have tht...i go out almost everyday, and ask her tell me if something is missing, or dont cook tht thing if u dont have all the ingredients, i dont have a car i cant run last minute everywhere....but no she wont listen...we suggested her to carry a list for things and topping them up, she wont listen, she wont even let us take over it so we can take care of it...i never argue with her...if i dont like something i stay quiet ....but i dont know whts wrong with her...she would not treat me like she shoulddd...she wont let us take the charge or stop complaining...she acts like a very rude woman...when i see at my mum, and my bros wife, shes so different...shes so nice mother in law....helpful, considerate and motivating,...wht did i do to get this one...how should i react noww,..what should i do....i m so pissed offf ...i remember once i have been out for groceries 3 times in one day by walkkkkkkkkkkkkk !! she treats me as if i m not a person to be respected...then when i see at her daughter whos not in good terms with her mother in law...apparently her mothr in law is bit cruel, i think IS IT KARMA...the way u treat someone elses daughter, similar even more serious thing happens to ur daughter...it has to be karma....may be i shouldnt say so...but i really am upset...i dont want to wish bad for her...but cant stop my heart wishing something like tht for her seriously...she brings me to tears