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Thanks all for the replies.
Problem with getting risers or a steeper stem is she has a very short reach and is using swept back bars and a 50mm stem to compensate any changes there would compromise her position.
I think we'll maybe leave it where it is for a while, I am sure it isn't dangerous as such. She probably only weighs about 7 stone and isn't likely to be exerting a huge amount of force on anything.
Best to ask the fork manufacturer - lightweight all-carbon forks often come with restrictions in the 40-60mm range, but the stock Pomp fork has a burly enough steel steerer. Bearing in mind than I have a 14cm stem on mine and 30mm of spacers under it, and I weigh 95kg, Tababa's girlfriend isn't likely to give the steerer a hard time unless he's a serious chubby-chaser.
All the other suggestions still apply - get a stem with more rise, and bars with more rise if possible, but only to make the whole thing lighter, stiffer and more pleasing on the eye. The fulcrum against which we're all trying to snap off our steerers is the upper headset bearing, and the only way to move that is to buy a bigger frame.