See she came in, looks healthy and well fed.
I am not expert enough to say pure or not, But she is very nice and will make
a great mate for your male. How big and was she eating right away?
Is this ray a longterm captive?it looks like it could be wild caught to me judging by the old scaring(damage) to the end of the tail,i know this can happen in aquaria but this end to the tail is very typical of most wild caught black rays....my guess would be wild caught King Henlei.
Very nice looking girl!