The Book of Acts mentions both Queen Bernice and Princess Drusilla in ca 57-59 A.D. Paul had been arrested to save him from young priests who vowed to kill him for bringing Gentiles into the Temple and Roman Procurator Felix wanted to hear what Paul was saying that was causing such turmoil in Jerusalem. His nineteen year old wife Drusilla daughter of King Agrippa also came to hear him.
“And, after certain days, when Felix came with his wife Drusilla, which was a Jewess, he sent for Paul, and heard him concerning the faith in Christ. (Acts 24:24
So, if two actual historical queens took Nazarite vows in Jerusalem 20 to 30 years after the death of Jesus, is it too far afield to think that Mary/Mariamne made a long-term even life-long Nazarite vow until her prophecy was fulfilled…until her son returned to claim the kingdom? It will be a short discussion.
My first thought is, if I had a prophecy that I would bear a special son, I would want to look up how to do it right. Pre-google, you went to a scribe to look it up in the Torah or the prophets, as clearly the gospel writers did for the prophecies Jesus fulfilled.
And…in another “believe it or not,” there is a prescription given to a young woman by an angel on how to bear such a son…it is the story of the mother of Samson.