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Sorceresses create magic the way a poet creates poems, with inborn talent honed by practice.
They have no books, no mentors, no theories - just raw power that they direct at will.
Some sorceresses claim that the blood of dragons courses through their veins. It may even be true - it is common knowledge that certain powerful dragons can take humanoid form and even have humanoid lovers and it is difficult to prove that a given sorceress does not have a dragon ancestor. Sorceresses even often have striking good looks, usually with a touch of the exotic that hints at an unusual heriage.
Still the claims that Sorceresses are partially draconic is either an unsaubstantiated boast of the part of the certain sorceress or envious gossip on the part of those who lack the gift.