I would recommend an India like system if your daughter is deficient in mathematics. Also, mathematics is unique in that it deals with absolutes. It starts with some axioms and places everything else on top with irrefutable proofs along the way. Its not for everybody (even though I would like to think that most people can enjoy the beauty of the subject). I also have several friends who are brilliant but run away from mathematics like it was the plague. There's nothing really wrong with this unless it affects their success in their own field/life/career etc..

Maybe you daughter just isn't very fond of arithmetic (what most high schools teach). An introductory book on some axiomatic branch of mathematics may be useful in that case.