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I thought we had put this one to bed, not to worry ..
The reason I wouldn't put Amazon on the cv is, the rest of the cv is glowing with continuous employment from leaving school. Developing from floor level to management with each and every job.
I suppose 3/4 weeks doing a number of 'zero hour' jobs shows that she is adaptable, versatile and a grafter. Personally I think, " yes this period should be mentioned on a cv, but only as 'agency work between jobs'. If at interview stage she was asked about this period, then the truth can be told, no problem.
.. and yes OG she has had 4 offers of employment, all part time and all 4 are willing to wait.
.. thanks to everyone who has answered and I now understand about zero hours contract, the rota and the obligation that both parties have. It's no basis for a longstanding relationship, but it is what it is.