A pocket oracle deck is a small, portable deck of cards that provides guidance, inspiration, and insight. These decks usually consist of 44-54 cards, each with a message, affirmation, or guidance.
Unfortunately, I couldn't find much information on Mildred Payne or her Secret Pocket Oracle deck. It's possible that it's a lesser-known or self-published deck. If you have more information about the deck, such as the publisher or release date, it might be helpful.