Well, depending on your environment and history (your wife's in particular) that fact that mono is all she can 'see' is a very real problem. Living life with blinders usually is in general.
The only possible solution is education and hopefully she's the type that can enjoy that just for the knowledge's sake alone. It doesn't mean we change our views when we learn of others, but the understanding alone makes for more kindness and tolerance in the world.
Get reading ! Get some exposure where possible. Hope for the best and see what develops. Cultural conditioning can be a dangerous thing because it can blind us to changes happening around us.