Hello,
I am a native English speaker from the US (currently living in France) with 3 years of experience in teaching, and I believe I could help your wife attain her desired level in the language.
I have priced my lessons at $15/hour because this is really the minimum that private tutoring will cost you, nearly anywhere in the world, for someone with experience. In the past, I have charged up to $80/hour, so I am confident that you are getting an excellent deal.
I have tutored both children and adults to great success.
If you'd be interested in working with me, let me know!
Cordially,
Sofia Mena