Reading 'the story'...
Makes me highly, highly critical.
The laundry powder has no bleaching activator, so will probably not work effectively at lower temperatures. Thus you'll have to use hotter water to achieve the same bleaching effect.
No enzymes, so cleaning and stains will take a hit. Does she even realise that enzymes could allow her to wash more effectively with less product?
Did I read somewhere that coconut soap is difficult to rinse out of towelling type materials?
I DO agree though, with the lack of perfumes/fragrances.
And what about suds control? None present as far as I can see.
Nah. Overall, I'm of the opinion that the detergent makers (P&G, Lever, Colgate, Henkel Dalli, etc) have researched the ins and outs of cleanability of detergent components, and got it down to a fine art - through proper experience.
Those super mega green eco 'detergents' (i.e.'soap' in disguise) promise a lot, deliver little and cost a bomb into the bargain. You'd get superior performance from a box of 'ACDO' soap powder.