Just like Yasodamayi treats Krishna as her begotten Son, and forgets Krishna's inconceivable power. Therefore, she asks Krishna to open His Mouth to see whether He actually ate some earth. He showed her that He swallowed not only a bit of earth, but the whole cosmic manifestation. Yasoda Mata was astonished to see this miracle, but still she forgot that Krishna is God, that Krishna is the Supreme Lord Himself, and not her ordinary Son. In this way, reciprocation between the Lord and His devotees takes place. The Lord doesn't forget but in order to enthuse the Pastimes of the Lord, the action of Yoga Maya is prominent.
N.B. Yes, you may take up such debate, but not any quarrel or argument should take place. It is good to have such debate, and to know the various arguments which the Mayavad philosophers put forth, and to know how to fully defeat each one.