i think this was the straw that broke the camel's back.
Disney wants to be family friendly, stay out of trouble and controversy, she was probably warned several times in the past about her tweets etc that upset various different people, and this was her last strike, which is a shame, as I liked her character, and in the past in interviews she's come across as nice, and talked about issues affecting her and other women in showbusiness, and been a positive role model, recently, not so much