I agree with that (especially as she hates her job). Anyone with such a good handle on their own budget could possibly be quite an asset to a company or organisation.
Up until recently I was doing volunteer work for a non profit organisation that wastes money and resources in a way that is nothing short of scandalous, and if their donors knew I'm sure they would object. I suspect there are many others like that that your friend could sort out, maybe she just doesn't have the confidence to go for it?

Short arms & deep pockets.