Thanks Everyone! I initially was reading articles that warned not to wet the hair, but that didn't seem right so I just had to come here and ask...
I don't own any shampoo, but I was able to co-wash her hair with Vo5 conditioner. It has a good lather and it was able to remove most of the sand. I will definitely co-wash again in a couple of days to make sure the rest is removed completely. Thanks again guys!