I believe she said she didn't want to even go as north as Denver, and seeing as how Boulder is an hour north of Denver, and I think now the highway even costs money around Boulder? (Been a couple years for me.) I doubt that is on the agenda.
Like I said. hit Salida up on your way to the royal gorge, as you will likely be travelling along hwy-50 through the area coming from Texas. All the shops have concentrates, I just think that Natures Med. is the best along your route. Have also heard good things about Maggies Farm, but it is a larger chain if I recall and I am a bit wary of those types of stores.
edit:
If you do go to Boulder though... I highly recommend checking out Boulder Wellness Center right around 55th and Arapahoe. Been like 4 years since I lived there, but that was my go to place for several years during the med-shop buildup period. (tried all of them in town and in the metro area during that time period.) And then do yourself a favor and stop by Thai Avenue in the foodcourt on the hill and try their street noodles. If you are a fan of thai food that is.