You're correct, pinkies are not a meal to an adult corn snake. Wonder what's going on with her digestion- would really help to know her age, as when snakes get old they eat less often & don't digest as well. That's what's going on with my 22 year old corn- he doesn't eat as often & prefers smaller mice. (He actually regurged a large mouse about a year+ ago.) What size mouse did she eat on August 2nd? If that was a large mouse, maybe you need to downsize to smaller mice (but not pinkies, lol) that she can better digest.

What temp. is the "cool" part of her home? & what temp. is IN the warm hide? If the warm hide is TOO warm, she might avoid it, & then be too cool to digest well. That's what it sounds like.