MET photographer's 'Ingret' is pseudonym for Ira Bachinskaya. She worked a lot with Bella A outside MET.
There was another MET set in 2005 "Russian Bath" with Ingret A http://coverswww.met-art.com/met-art_covers/050630-BELLA-INGRET-KRISTINA-KIRA-INGRET-129-2138.html
Haven't been able to trace links/pics of that Ingret. So am not sure if she is Ira Bachinskaya.
http://www.dreamstime.com/ingret_info/ http://www.photosight.ru/users/37453/
Well, in any case you've now some leads for further search.