Hmmm, I'm not sure about the actual tour. But there are rules about flying while pregnant. She probably should call
ABD to ask them directly. While they may allow up to any stage of the pregnancy, there could be activities that she won't be able to do. I know that horseback riding is completely out when pregnant. She also should check with the airlines, if she plans on flying. I'm not sure what doctors are saying now a days about riding in a car or bus. It use to be after you hit 7 months you were not to go on long car rides. Usually anything over an hour without a break was a no-no. But I know things have changed in the last 20 years. Sorry I couldn't be of more help.