These are never rules of God and are not supported by any authentic scriptures. They were rules of hygiene as is evident from restrictions to crowded places and touch etc, to prevent infection. To ensure the practice it was given a religious twist. But as happens, though the times have changed, the rules continue to hold as mere irrational beliefs. The Mother was asked about it and She did not endorse any of it and allowed women to come and participate in all activities including physical education. After all if a menstruating girl can go to school then why not to a temple given that God is everywhere. The only restriction that makes sense is sexual activity which is obviously again a helpful thing for the woman.
Affectionately,
Alok Da
