Yes, IMO your 9yo needs to be challenged in mathematics if she is to realise her mathematical potential. Being challenged in other areas is better than being challenged nowhere, but it's no substitute for being challenged in mathematics, because the essence of mathematics is struggling with problems that are not easy for you, and if she doesn't get the chance to do that she isn't really learning mathematics. I could talk for hours from personal experience about the deleterious effects of getting all the way through school without ever finding anything hard in maths...
... but fortunately someone has done the talk and videoed it so I don't have to. Here's a talk Richard Rusczyk gave on this topic which I think every parent of a child who's ahead in maths should watch:
http://mathprize.atfoundation.org/archive/2009/rusczykBtw, Alcumus, run by RR's artofproblemsolving organisation, is free and my DS likes it very much.
