This looks like the common 'Naked Lady' or Amaryllis belladona. But if it is I can't believe in 4 years it hasn't made more bulbs or seed that sprouted. They are blooming in my garden now. Maybe it is Amarcrinum, a cross between Amaryllis and Crinum. The Crinum are also blooming in my garden in northern CA now. Do the flowers come up fast with no leaves? After the flowers are finished and gone, does she get leaves?