From what you described, I don't think it is a question of difficulty. It appears that your DD doesn't want the math enrichment. If you feel strongly that your DD get some sort of math enrichment, can you involve her in the decision to choose the type of math enrichment? Perhaps go lateral for fun stuff rather than vertical. Perhaps you can give her some choices as to when she wants to schedule those periods of math enrichment? Maybe you can reward her for not making careless errors the first time through?