The square footage they estimated is ~30% larger than the actual area of tile. Extras and add-ons that are unneeded. And they will destroy the subfloor and charge her extra to fix that because they won't be able to pull up the Hardie board without screwing up the half inch decking.
@FireMonkey people like that shouldn’t have a license. I’m happy for her that you’re available and willing to help her. Too bad she thought a big box store would treat her better than a friend. #LiveAndLearn