The right to mis-define oneself

[Nope]

Define 'has to'. I really don't know what you mean. She is female. She isn't 'imposing' anything on anybody.

If she chooses to go to a public instituion which allows nudity, like a changing room in a gym, then what?  Should other women have to put up with the sight of her penis flopping around in the ladies' changing room?  What if she decides to start dating, and she takes a man back to her place?  Should the man, upon discovering her penis, accept that she is a woman anyway?

What if she has a sex change, and doesn't tell prospective male sex partners her history?

I think transgender woman works fine, and I'm fine with "she."  But Jenner is not female in many of the ways that this word is normally used.  That's a statement of physical reality and simple semantic awareness.

When I have been in situations where other people were changing clothes, I didn't really look at them. Do other people watch each other getting dressed? Your descriptions makes me imagine her penis detaching itself from her body and flopping on the floor like a fish.   

People can say no to having a romantic relationship for whatever reason that they wish.