When I read the title I was thinking it was a new bootie - like ducky slippers or something. I had to read the post b/c I just couldnt imagine how they were making a Frito slipper.
ok, now I know it's just a smell issue.
Does she have the hair between her pads clipped? I think sometimes if you don't get that clipped short it can stink. Remember they don't bathe everyday like humans yet they walk thru grass (and whatever might be in the grass), sidewalks have all kinds of gunk so maybe try using a wet paper towel to wash her feet off every night and keep the hair between the pads clipped.