It sounds like your mother helped you as much as you helped her. She has a right to split the inheritance equally between her children — probably the majority of parents do this, despite what some children see as strong reason to do otherwise. This seems the ‘default’ version of ‘fairness’. If you feel taken advantage of, you can move out and get your own house or apartment and your mother can get a home health aide. I doubt arguing your case to her has any chance of changing her mind.