This is appalling!
Whoever conceived this is utterly ignorant of the power differentials between men and women; the life experiences of women and the rate of sexual assault by men; and the effect of these traumatic experiences on women's lives.
Gut feeling is often the only thing we have. Abusers don't wear a sign. The only way they might give it away is by violating boundaries. And given the current fashionable strand of trans activism positively encourages boundary violation how could you blame a woman for not taking chances?
I'd say fucking well done to that lady if she felt unsafe. Me, I'd have stayed in the lift. Not because I'm a cool girl ally but because I tend to freeze when I feel unsafe. I would have felt socially trapped. I may have feared that leaving the lift would have made the transwoman angry, and angry males are extremely threatening to be around.