On the other hand, there are a lot of Walmarts and similar stores, and a lot of people who have managed these in the past. There are many people who she can turn to for reliable advice. I'm assuming one Walmart is not fundamentally different from another. It's hard work, but it's essentially predictable.
Software developers are often called to do work that's not predictable. At the top of the pay grade we're generally asked to design something novel, because it's obviously not worth paying $240k / year for a developer whose work could be replaced by off-the-shelf software. (Sure, there are many exceptions and cushy jobs where people are raking in the cash with few risks. I'm thinking there are probably less of these around than a few years ago, though.)