According to TMZ, Kris Jenner did not have any hint that Bruce Jenner had a conflict with his gender identity during the course of their 25 years of marriage, which he only revealed to his daughters after their divorce. In fact, her daughters knew about this before her as Bruce chose to divulge the news to his daughters before telling her.
On Bruce Jenner’s gender dysphoria, a source further confirmed to TMZ that he however previously talked about his “tendency” to dress like a woman but not to become one.
Source: www.tmz.com