According to our friend with the knickers worn over the jeans in the screenshot above, "her book business and reputation could benefit more" (from shutting up, presumably). How? She's the best selling author of her generation and has given away more money than even most millionaires will ever earn.
They clearly don't understand that her career has been already made for generations to come. Even if she never writes another word, her books will keep on earning millions even after she's dead, millions for her daughter and daughter's kids, for 75 years after her death! 
Just see if you can stop that momentum by screaming Transphobe.