If "memorial" means she passed away, I sympathize.
I see a Mexican Petunia cultivar called 'Katie Blue'. That's CLOSE to Katie Sue.
Ruellia brittoniana
USDA Cold Hardiness Zones: 8,9,10 (too warm for your location?)
They are out of stock at Almost Eden (1 plant for $20).
http://almostedenplants.com/sh...
But ATP member imabirdnut offered to trade seeds or plants.
I guess you already checked the ATP Plant database? I see pages of "Katies" but I only checked a few for vendors.
(Hemerocallis 'Katie Sue Loves You')
and
(Dahlia 'Katie Sookie')
and
(Hemerocallis 'Katie My Love')
Brent and Beckys Bulbs have a 'Katie Heath' daffodil
https://store.brentandbeckysbu...