I was afraid something might be able to passed through the eggshell, I'm going to call the lady and cancel. I don't want to bring anything into my flock. If she lets me see her flock would I be able to tell if they have MG?
there are other illness that can be passed to your birds too. But most of these can be passed by all kinds of means even a visit to the feed store can bring back the virus.
All kinds of bio security measures are discussed in most of the indiana poultry literature and the purdue sites. I would look into those before deciding to even ask if you want to see her flock. Honestly I don't let just any stranger come see my flock now days. The person coming might bring my birds some sickness. It does not mean that I don't have great birds in a great set up. It is just a method I use to limit exposure or risk. Some bio measures are a bit extreme while others are common sense.