Wash the hands lots and the colour will fade quite quickly.
She could rub the worst areas with a microfibre cloth (wet it and ring out so nearly dry (no soap, just water) and scrub the area) and if really desperate then she could use a bit of bleach on it and then loads of moisturiser afterwards (this is not something I would recomend to a client) as bleach is not good for the skin.
Lemon Soap too is very good. Apply same way as Baggybear states or use a crispy,hard air dried towel, put your finger into the corner of it, rub on soap and rub on stain, allow to penetrate, rub some more, this fades stains fairly quickly. More so than anything else Ive tried on my poor hands when im too lazy to put gloves on to clean gun out!!
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