Forgive me if I'm slightly off topic, but I was witness, here in Southern California, to ordained nuns over 20 years ago. WATBUDDHAGODOM was an interfaith south east Asian Buddhist Temple founded by a Lunpo from Vietnam, came as a refugee to Thailand, and settled In Highland California and built two small temples on a large block of land, now unfortuanetly a housing tract. He may have been Mahayana coming form Vietnam, but he was interfaith serving Vietnamese, Cambodian, Laotian, and Thai Buddhist, the majority of which were Therevada. The small Vietnamese temple had a huge 15' tall statue of "Mother" a woman with white skin, possibly related to Quan Yin, the Thai temple was traditional Therevada Thai buddhas. I lived there for several months around 1990.
Ok well now to my point, this Lunpo believed in the ordination of women, and had invited two or three Buddhist nuns to live at the temple, not in white, but full orange brown robes, they lived in a mobile home seperate from the monks quarters, the thing I don't know for sure is whether they were ordained in Mahayana or Therevada tradition, and where their ordination occured, unfortunately I knew so little about the absolute rarity of this situation, I never thought to question them about the circumstances of their ordination.
But yes, I believe the order of nuns has already been re-established, its just a matter of not everyone recognizing them, I haven't heard stories of them being ridiculed or disrespected for being nuns, just not everyone accepts that they actually are nuns, as many of them don't believe in nuns. Very much like women Christian or Catholic priests or ministers, they exist but are not universally accepted.
18 years ago I made one of the most important decisions of my life and entered a local Cambodian Buddhist Temple as a temple boy and, for only 3 weeks, an actual Therevada Buddhist monk. I am not a scholar, great meditator, or authority on Buddhism, but Buddhism is something I love from the Bottom of my heart. It has taught me sobriety, morality, peace, and very importantly that my suffering is optional, and doesn't have to run my life. I hope to give back what little I can to the Buddhist community that has so generously given me so much, sincerely former monk John