I can't remember the name of this book?

I'm looking for a book I read like last year. It's about a girl who lives in some sort of village with her mother and all the people there are ruled by this one evil guy. They have to work all day to get water (they scrape it off leaves, etc) because it's magical or something. Anyway, if they can't get enough water, they get beaten, and the main character's mother always volunteers and she takes the beatings for the rest of them. The girl has 'special blood' or something and she adds it to the water so they whoever drinks it lives forever (?). She also uses it to heal her mother's wounds from the beatings, but she never heals it fully, so the ruler man won't get suspicious as to how her mother heals so fast. Anyway, a new guard comes to help the "boss", but he is actually a nice person. (I think his name was Franklin or something like that?) He feels bad, but the ruler is paying for his mother's medical bills, etc, so he can't do anything. They fall for each other in the end, and he takes her to this outdoor theater and stuff. She's never been outside the village and stuff. Anyway, once the water tanks are all filled, they have a big celebration. However, when the nice guard guy gets beaten up ( her mother had something to do with it, because she found out about them) she steals all the water to "heal" him and he lives in the end. If you know this book, put your suggestions down, thanks in advance!