Nah, she was born without the 'shoe gene' - money better spent in restaurants or football.Tell her she can spend the electricity savings on a new pair of shoes.
She does have a problem with fluorescent flicker (maybe that's why she spends the minimum of time in shoe shops) - so there could be a way in there.
love the footnote BTW - especially the value of relationships
Look - it's simple. Just tell her that with some decent fluorescent strip lights she'll be able to see much more easily when she's cooking your dinner.