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@jtfh
I've done exactly this for a few friends and we invariably ended up buying a cheap Shimano triple chainset on discount somewhere for £20-25. The only catch is that you normally have to change the BB as well to achieve proper chainline. Plus chain and cassette of course, and then you're looking at a £50-60+ parts bill.
Ndeipi-
Ah right, didn't think about new chain & cassette - do they also need replacing along with new chainrings? Having said that, I've replaced chain and cassette very recently and it's only been ridden a handful of times since then, so that should be ok?
Also it had a brand new BB fitted this morning! So I'd want to avoid buying a new one...
yak
Yeah 1x would be simplest but she specifically wanted an old MTB for the wider gear range than her town bike, so going 1x7 would defeat the point, and upgrading to a massive cassette/10 speed etc would end up being $$$ for new derailleur, shifter, cassette etc
That SJS page is the same one I've been staring at for ages scratching my head... I'm thinking it might be safest to look for a second hand crankset