My Dear Balai dasi,
Please accept my blessings. Thank you for your letter of Jan. 8, 1968, and I have noted the contents carefully. Regarding your questions: Yes, leave Krishna's plate for 15-20 minutes or more, not more than half an hour. After offering the plate, the balance in the pots should be distributed immediately. The plate can remain on the altar while the rest is being distributed.
Any initiated girl can take part in preparation of prasadam, and even a boy who is not initiated cannot take part.
Maya and living entities are different energies of Krishna and all of them are eternal. Maya is acting under the direction of Krishna but her task is to punish the revolted living entities; therefore, she has to business in the spiritual platform. Maya cannot go to Krishna means that Maya's influence cannot be active in the presence of Krishna. The example of darkness can be given herein. The darkness has no existence in the presence of sunlight, similarly Maya cannot exist in the presence of Krishna. As darkness and light exist eternally, similarly, Maya and Krishna exist eternally, but Maya has no existence in the presence of Krishna. Try to understand this simile.
The material body has got heart and Krishna is seated there with the jiva in His Paramatma feature. Krishna is so powerful that He can become smaller than the smallest and greater than the greatest. He can keep millions of skies within His Belly and at the same time He can enter within the existence of the smallest atom. He can enjoy eternally in Vrindaban with His Associates, at the same time He can present Himself in every nook and corner of His Creation. These are some of the inconceivable potencies of Krishna and as such living entity can never be equal with Krishna. The Mayavadi philosophers try to keep Krishna and living entities on equal level and that is proof of their less intelligence.
I hope you will understand these explanations, and distribute them to your other God-brothers and sisters. Hope you are well.
Your ever well-wisher,
A.C. Bhaktivedanta Swami