Easier to train dressage horses to jump or jumpers to perform dressage?

No such thing as 'dressage blood' or 'jumping blood' or 'barrel blood'. Those are all sports and disciplines horses are trained for. Certain breeds are better for certain disciplines than others but it is by no means exclusive.

Every horse is different. Blood hardly means anything. Yes, warmbloods are still warmbloods and tend to be good in both jumping and dressage.

Her "pure dressage horse" might even be better at jumping that at dressage. Your jumping/dressage horse might have a secret knack for barrel racing. Just because a person might come from a whole line of professional swimmers means that person will be any better than someone who is the first swimmer in their family.

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