One % of gross is only given to big name actors. No art director is ever getting that. Best they get is % of net, which is always 0, no matter how much money the movie makes.
Two, "they agreed" is a shit fucking excuse when talking about power-imbalanced relationships. She had the choice to either starve or accept the $300 a day. Some fucking choice.
Three, if it weren't for her and others like her, movies don't get made. Some fat cat sitting around all day is the one who's going to eat up the profits from this, fuck them and pay the artists that made this happen.