If she is disgusted by it, there is very little chance of her changing her mind I guess.
That's not always the case. I've tested waters on this matter with my GF for about 1-2 years by throwing random conversations about homosexuality/pedophilia/zoophilia whenever I found a chance. Тhe only time I got brave enough, and randomly out of the blue asked her opinion on zoos, she said "I think they should all be shot." .
We are together for 6+ years now.
But about a month ago, I decided I can no longer live with all the hiding of the real me (a heterosexual man interested in women, bitches and mares). I could put all my money on it, I was about 99% sure that would be the end of us, but preferred to split instead of living in a lie. To my surprise, even tho she was a bit upset with me for hiding it from her for so long (since I was zoo before we even met), she accepted me as who I am and our bond is even stronger now. We have talked a ton on this matter and she is okay with me having bitches/mares, since as she says it "I can't turn into a dog and satisfy this part of your sexuality" .
So her view on zoophiles drastically changed since then. She realized that the man she loves, has been with for 6 years, all along with my other positive traits and characteristics that she adores, is actually a zoophile, which showed her that we are not some strange monsters, but much like any other average joe.
Now from time to time I even joke with her and say "I thought all of us zoos should be shot
",which makes her feel bad and sorry about all her past prejudices towards different people.
OP my advice to you is to tread carefully. Mine or any other success on that matter doesn't mean there are not a ton of break-ups after confessions too, so you better be prepared for the worst.
First think about how well you know your girl, and her levels of open-mindedness.
Second check if in your country zoo is legal. In mine it is, but honestly I'm not sure I would confess to her if it wasn't.
Third, if you are not with her at least for 2-3 years, IMHO it's too early for such confessions.