I think to be so dissociated from your body, as a woman having penis-in-vagina sex and therefore so dissociated from the invasiveness of what's happening to her body, has to cause some sort of disordered mentality. So, it may not be the cause of what this is happening, but it surely has to be the result.
If she really is pregnant, there also has to be some level at least of dissociation from that pregnancy. She has to be mentally overriding the pregnancy at least hormonally to go through with something like this.
The whole idea of who or what she thinks she is must be truly exceptional.