Again, folks need to learn Gross versus Net. She is already spending 30% corporate tax written into the prices of goods and services she buys. That would go down to 9% corporate + 9% sales, or 18%- in other words a decrease she has to spend of 12%. She wouldn't be spending 9% more, she would be spending 12% less.
One thing that won't happen is prices coming down. I admit inflation would probably be slowed down, but prices will not come down. They never do.