Sorry I was assuming the friend was male. Dunno why. Silly wally, I am. Incidentally, I'm very much liking Sainsbury's own-brand pickled cucmbers in sweet vinegar now, so, sadly for Poland, no need to hunt down Krakus any more.
Right, the rider doesn't seem to need or want a triple chainset for her usual cycling. She will benefit from having some lower gears than usual when climbing with more weight than usual - but a triple is not the only means to get them. I'd say it mainly comes down to the point I always bang on about: the jumps between the gears. That what she should think about. There's also less frequent need to front shift if the ratios are chosen carefully.
Don't choose the bike by the chainset or cassette, though. Be prepared to customise both afterwards.
