I dunno, just feels like the "milking the cowgirl" part of the game and the "make drinks" part of the game are two completely different, standalone systems and not much thought was put into combining the two into one cohesive thing. When I played the game, I upgraded her production, like, twice, and basically just played the game like a standard coffee sim, since the demand for milk is directly tied to how much milk she's making, then when I upgraded her capacity all the way, I just spam the milk button in the shop to max her out and win.