SOLVED. Girl refuses to marry powerful man, gets turned into an old hag, meets lizard & rat, and disguises herself as a rich widow [s]

[Wailana]

The illustrations in the novel are very distinctive and rather stylized. It's set in a fictional desert-based country, specifically in a walled city. The book opens with the arrival of a powerful, rich man (sorcerer? He wields magic) who has a magnificent jewel in his turban and a heavily laden camel train. He sees the beautiful daughter of a rather humble man, and eventually asks her to marry him. Predictably, she refuses (he is an ugly man, I believe), and in retaliation he turns her into an old crone. Her family doesn't recognize her, and drive her away when she attempts to tell them who she is. At some point she gets shrunk, too, but I think it's later on. Anyway, she ends up finding a windfall thanks to a lizard (the prince, who was turned into a lizard by the evil sorcerer) who brings her gold coins. She sets herself up as a wealthy woman and invites the evil sorcerer to dinner. She poisons his wine, but he figures things out and shrinks her (aha, this is where it is!). She runs into a rat, who turns out to be someone else transformed by the sorcerer, and eventually they find his book of spells, perform the undoing spell, and everyone discovers that the lizard was the prince and the crone was the girl and the evil sorcerer dies somehow (I think he gets burned?).

Anyone else recognize it? I read it...oh, quite a few years ago, so it's not a recent book, nor is it anything more than a young adult's book, if that, and it's relatively short (it took me at the most a couple of days to finish it, I believe).

Help?

[Flowers]

This one sounds similar:
Is that the one?

[Wailana]

Yes, precisely! Thank you so much!