The Mother’s body was identified with the body of the earth as both herself and Sri Aurobindo have revealed to us. It was prepared in a special way no doubt but yet it belonged to the earth and especially after coming here She deliberately identified her outer consciousness with the earth as we see in Her prayers and letters of Sri Aurobindo. This was a deliberate act so that whatever she gained would automatically get transferred to earth. It is somewhat like opening a joint account with either/or survivor option. She has indicated this too in Her conversations.
Hence when She withdrew from her physical body, all the work that she has done got automatically transferred to the earth either to serve as a seed for the future or else to spontaneously initiate the process in those who are ready and prepared by or chosen by Her as fit and worthy receptacles of Her Glory.
Affectionately,
Alok Da