Imagine what she would have agreed to if you rattled out the standard error of the mean formula, or better yet, went through solving for
X and proving that when X =
0.999999, X really = 1.0. This gets them every time.
What are your plans (a, and back up of b and c) for the making your move? You absolutely need to ask her about her math life to loosen her up.....be conversant in the abstractness and contradictions of infinity. Maybe ask if she thinks the Greek's were limited in math because they didn't have the symbol '0'. Or let it slip that you find it fascinating how the Fibonacci Sequence is found throughout nature, mention that her beautiful face is the golden ratio at it's best, then whip out a sunflower and admire it.
https://www.mathsisfun.com/ might be your secret sauce.
Oh yeah, be sure to mention how marvelous you find it that when large groups of people who do not speak each others language meet in the same room, if they are musicians or mathematicians, they can immediately converse through their specific expertise.
Math is your way in, don't doubt me on this.