The binding of isaac?

i have the binding of isaac, both from a disk, and from steam. i used the free DLC code on the back of the manuel, and downloaded the DLC. i know i have the DLC, because i have found many of the DLC items (such as crack the sky, best friend, and white pony). however, in the DLC, i believe that mom is supposed to drop the polaroid all the time.
1: is she supposed to always drop it?
2: if so, how do i fix this "incomplete" DLC?

can i just... update it? or... what...? using steam.

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