Welcome..
Yes there are 2 english medium international schools that i aware in Nouakchott. AISN (American International School Nouakchott) located inside the American Embassy compound and the other one is TLC, located at Ksar area. For the education fees for AISN, 1st Grader and above, it would be around USD13,000 per annum and for <1st grader, it will be USD6500 per annum.
I can tell you woman boutique here are quite plenty & operated until a very late hours so i guess it's true that mauritanian women loves it.