Those prices (for the machines, I dunno about the girl) seem quite high for 1957. Consider that a 2-speed, 12-cycle, 3-temp, 3-water level Frigidaire can be had NOW for $277 from Lowe's ...
And an even more deluxe Frigidaire with 17 cycles, variable water level, extra rinse, handwash, etc., for $327.
[dodging the SLAP!]