If I know a person to be sexist, of course as a Feminist I wouldn't vote for her. Weird that you felt you needed to ask really.
Feminism isn't some free floating concept that follows the word "Woman" whoever it happens to point at, it follows the reality of the female sex, the inequalities we face because of our sex, and the social consequences that come with it.
There's deep Feminist insights associated with the experiences of and social constructs around feminised men, both those who chose to feminise and those who society forces into that role. It really illuminates the mechanisms of Patriarchy.
But these insights are only available if you recognise trans women are men.
If you try to frame the world around Gender and insist feminised men are actually, truly women, you lose these insights. You have become part of the same Patriarchal framework that Feminists are fighting to get rid of.