It's nice to not lie Emily, I'm all for honesty as well.
But around these parts there are homophobic men who will beat up or kill a beautiful transwoman just because they are attracted to her (and they don't want to admit it to themselves). She can be the most honest person in the world and it will make no difference. Just knowing that she's trans puts her in grave danger of dire consequences, if she's around the wrong type of people.
And you never really know how someone feels until it's too late.
But, if you're suggesting she go into a tranny bar that is filled with men who are actually looking to have sex with trannies, it's a different matter. She would be safe (providing she protects herself against sexual diseases). But then everyone would know she's a tranny anyway, simply by virtue of being there.