Donald Trump’s niece is spilling her family’s beans. Mary Trump, a psychologist by profession, has become known for her critiques of her uncle. Recently, she noted that the ex-president is being pushed “closer to the edge” due to the New York fraud case in which he was found to owe hundreds of millions of dollars. On Friday, Mary Trump announced a memoir touching on all these family issues and much more. ALSO READ: Here’s why conservative elites are bailing on Trump now Mary Trump said in a post on her Substack that the new book, which will reportedly be published by St. Martin’s Press in Sept…