Hi there! I just had a chicken with a prolapsed vent back in January. I also, have a vet that is an hour away. I put her in a pet carrier in the garage and kept it dark to make sure she did not lay any eggs. I cleaned up her vent and put vaseline on it too. I was told some people use honey. She kept popping out the innards and I kept putting them back for a few days, then I just cleaned them up and left them out since it didn't affect her pooping abilities. After a week, it popped back in. I fed her scrambled eggs and tuna in water. Sometimes I would add a little dried herbs into the mix too. I am not sure how your chicken is acting. Mine felt sluggish for a day or two and then acted normal while we waited for the innards to go back in. I hope this helps.