I get it. Is my way to say that she is mixing things. Having an Y chromosome or a penis doesn't make you a man or less of a woman. Some people has this idea that our sexual parts define us, but I disagree with that. This is just a part of you, not what defines you. My boobs doesn't define me.
I keep in mind what we are talking about, we talk about accepting the fact that some women have penis or refusing to accept that they are women. The moment you accept that a trans woman is a woman, you accept that she might have a penis (or not). But unless you are going to engage in sexual activities, the specific sexual parts she has are irrelevant.