And, if that poor woman survives, she's almost guaranteed to develop cancer of whatever's left of her esophagus. Take the thing in the picture outside and shoot it.
Esophageal cancer usually occurs in the context of chronic esophageal insults that continually damage the epithelial lining of the esophagus. This woman, if she does survive, won't have much epithelial tissue left at all to become dysplastic. That doesn't mean that there won't be some severe late effects from the damage, though. Alkali liquids cause a very penetrating form of tissue damage (as opposed to acids, which produce mostly superficial damage in the esophagus, and cause the most damage in the pylorus of the stomach). The poison could very well perforate her esophagus. Even if that doesn't happen, the tissue that is formed to replace the destroyed tissue won't be what the esophagus is supposed to be constructed from--it'll be all fibrous tissue. As the collagen in the scar shrinks with time, her esophagus will gradually constrict. And the destruction of smooth muscle and nervous tissue would combine with the constriction to make it VERY hard for her to swallow. Not very fun at all.