Oh Jason, I'm so sorry...I kind of already knew this, but you had to be made certain of it, and now that you are you can take the appropriate steps to keep Jazz and Chessie as healthy as they can possibly be, and protect your other birds who hopefully have not been exposed to the ABV...
I'll just say this again for good-measure, you MUST boil all of the eggs, not only because you don't want to have a clutch of infected, sick chicks (their immune systems don't even develop for the first 2-3 weeks, so they would likely only suffer and die very quickly after hatching anyway if the parents have been exposed, keep in-mind that birds can actually carry the virus and not be actively infected with it), and if the parents are infected with it they just cannot put out the energy it takes to raise/feed a clutch of babies, it will surely kill them...I'm so sorry that you aren't going to get to experience this right now, but that doesn't at all mean you can't breed them later on, when you're certain you are breeding 100% healthy parents and you can keep them quarantined from before-breeding all the way through the weaning-process...So it's just a temporary delay...
***I'm only saying this due to her already exhibiting neurological symptoms, but if I were you, I would just assume that Chessie is suffering from active PDD, as outwardly displayed by the gradually progressing issue with flying. That doesn't mean she is going to die, it doesn't even mean she will experience any other outward signs and symptoms of either disease. And that's what is important that you understand about both the ABV and the PDD, that neither is a death sentence, and they don't even necessarily mean that either bird is going to become actively sick, at least not beyond the neurological symptoms Chessie is already displaying...and it's very likely that she'll slowly regain her ability to fly with control and land with control as time goes by...
It's all about keeping their overall physical and mental health in as good a place and condition as you possibly can....I would highly recommend that you start giving all of your birds a daily Avian Probiotic supplement to protect them against any Fungal/Yeast infections throughout their GI Tracts, their Sinuses and Upper Respiratory Systems, and on their external skin. Secondary Fungal/Yeast infections are extremely common in birds with ABV, as their immune systems can be the main thing that suffers...So it's all about protecting them against the most-common infections/illnesses that can arise in their situation...
And that's what I would research, exactly that...What are the most-common secondary-illnesses/infections that arise in birds with ABV, and what can I do to keep my ABV-infected birds with a high-functioning Immune Systems, and what holistic supplements are going to help to not only boost their Immune Systems, but also protect them against secondary infections/illnesses...I give all of my birds a daily Avian Probiotic once a day in the morning sprinkled on their pellets and seed-mix first thing in the morning, and noe of them have ever had any type of Bacterial or Fungal infections at all. Ever. Keeping their beneficial bacteria high is a great protective measure...But there are also others, and that's what you need to research...Google is your friend here.
Just know that everyone is here for you, we support you, and we'll do anything we can to help you and your flock...And don't think of this as the end of the road for your birds or anything of the sort, because it's not that at all...It's all about knowing they have it, which you now do, and taking the best measures you can to keep them healthy and from suffering from any Secondary issues...It's not ever the ABV that kills a bird, it's the secondary infections and issues that do, just like in human Retroviruses such as HIV/AIDS, same thing. No one dies of AIDS, they die of things like Pneumonia, Yeast Infections, Bacterial Infections, etc...Same thing here...
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