Welcome!
My only thought is, there is only one fill up. It will be hard to really see much difference without past numbers. Regardless, look forward to seeing your progress!
(I had the same issue, because I took a brand new car (no baseline) and started modifying it before the break in period was over. So I can kind of calculate some stuff from YOY results, but as long as you keep driving known effective mods, things should improve.)
(Though getting her engaged with a few of these:
100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com may do more than a lot of mods.)