Great suggestions above. You could also try weakening your force, if goblins no Gundabads, Marauders or Shamans, if Harad no Watchers, Corsairs, Abrakan Guard, if Dwarves no D7+ models (except heroes), no Durin's folk front line with Warriors of Erebor behind etc. Hell, you could even take your dreaded Grimhammers and see if you can win with them
That way the game's still even (so if she wins it's not because she had more points, your wife will have more chance and you will find the game more challenging, it'll also probably be fun for you to use a slightly different list.
Might work?
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