She could use the text to speach function, but finding the correct button combination to press would be difficult.
I'd like to be able to set a keyboard shortcut to turn the TTS on or off from any one single button.
I don't think you can use a single button to launch an action with the current launchpad. You have to use an activator(currently Shift) and key combination. However, you can use a combination that is more conveniently located than the default Alt+Sym, for instance "Shift,Z" (button in the lower right corner followed by a button right above him) could be easy to find by touch.