Gosh! It would be great if it could survive - not sure how much grazing there is on Saadiyat? Thought it was all sand, golf courses and construction.
I don't know of any wildlife organisation, perhaps the closest to that would be the Falcon Hospital? Don't know if they'd do anything though.
I work on Saadiyat Island and a gazelle has been spotted roaming around near New York University Project. Not sure if it can sustain itself on an uninhabited island? Can it? Or is there wildlife rescue in AD that can come and check it out?