Having suffered from acute motion sickness for my time in military aviation and also now in civil aviation, I feel I can add plenty of advice.
However, rather than type it all out again, can I refer you to my post on the following thread
http://www.pprune.org/forums/showthr...threadid=89833
Stugeron is quite a good aid for combatting motion sickness as are "Qwells". However, both do have side effects of causing drowsyness. Certainly taking 8 a day would cause some effects!
In any case, your wife may well become more adjusted to it the more exposure to flying she has, and you may not need to take the more drastic measures.
Good luck,
Obs cop