Notepad + some browser. Best to start with the simplest and most transparent tools IMO, + its not really difficult to save, switch windows and refresh the brow

Notepad + some browser. Best to start with the simplest and most transparent tools IMO, + its not really difficult to save, switch windows and refresh the browser. I say this because a lot of HTML design tools take away the necessity to actually learn what goes on with the HTML and CSS, sometimes in subtle ways. If you want easy use MS Word and save as ".html" or FrontPage or whatever, but that won't teach her much about HTML or CSS directly... (EDIT: Also they are free and available on every computer with a Windows on it since 2000/ME I believe.)