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.
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.