Graham writes: 'My partner is my confidant in my magic. I practice with her, and she knows all… I was wondering if you could point me towards a magic trick that could still blow her mind. Then I would know I can fool anyone…'
If your partner knows all, then I'd class her as a 'magician.' Don't spend too much time trying to fool other magicians.
What 'fools' a magician is no measure of what will entertain someone who hasn't 'seen behind the curtain.'
It's wonderful that your partner is helping you with your practice, and you can take advantage of this as much as possible. However, I'd warn against judging the quality of your magic performance on her reactions.
It would be time better spent to seek out a fresh audience. Volunteer to do an hour of magic at your local community centre, or at a rest home in your town. That will prove to yourself that you can fool anyone. Best of all, it’s at zero risk because you're an awesome guy and helping out in your community.
However, I'm aware that might not be the type of answer you wanted so..
Hope this helps