Cognitive dissonance. Happens when I'm obstinate, but that's not important.
Y'know what I said about dozens of reasons not to do something? Yeah, those are really, really easy to make up.
If she's already told you she, too, wants to be with you, then you have no conflict of interest, and all it would really take is persistence.
No argument resists complete and utter ignorance of it. Sometimes it actually takes
not listening to something to make it work.