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If you have to much, you are creating a long cantilever from your head tube to your bars. Thus, big bending moment in the steerer tube. You are risking it yielding and failing all together.
Assuming the hand position is the same, the moment is going to be the same, no?
NotThamesWater-
You're right, clearly I'm talking bollocks. I guess what I should have said is that the system with lots of spacers will be less stiff, as you have a relatively narrow long span of tube vs a shorter span with stiff stem making up the system instead. I think the lots of spacers case will deflect more, but you are right, the forces/moment will be the same.
Maybe buckling could be an issue with the longer stack system? Regardless, still don't recommend it.
Hovis
Not a good idea. I think 4cm is the maximum anyone will recommend for spacers. If you have to much, you are creating a long cantilever from your head tube to your bars. Thus, big bending moment in the steerer tube. You are risking it yielding and failing all together.
Get her some risers. Maybe consider a 17 degree stem pointing upwards too to reduce the stack some more.