First off....WELCOME TO THE DIS!!!!

We are glad you found us.
Our DS has a peanut allergy and we able to dine at Ohana and have a wonderful time. We had called ahead about it, but they basically said to mentioned it to our waiter. We did and he promptly brought the chef out to talk to us. He went over everything, where it is cooked, and stuff like that, telling us what was safe for DS. What works out well for us is DS is not an adventurous eater, so he had a kids meal anyway, LOL, but they were still very helpful in letting us know exactly what was made where and with what.
I believe the shrimp is on its own skewer, but Im not sure how close it is cooked to the other meats. Im sure if you mention the allergy they would take precautions to cook the other meat that the allergic person is going to have safely. Also, there are shrimp I believe in the wontons, so they may need to take precautions with the appetizers too.
So my advice is to just let your server know about the allergy and they should take very good care of you all.
Enjoy! Ohana is really a lot of fun with delicious food!