since this was a friendship you wanted to keep; I think you made a really good decision. I completely understand the idea of "lying" about finding another demo but continuing to order small things from her. After all, this is a hobby and not something you want to be stressing over.
But in the end, as you stated, stamping supplies are NOT worth ruining the friendship over. So glad you talked to her and found a solution! Good Luck! I was a demo for a few years and I really loved it. Especially liked being "in the know" on the specials and products and being able to order early. Have a blast!
Mary in NC