Re: Ruby
Hi and welcome to you and Ruby! 
The CC makes this tough and is just about 100% proof of Cushing's - it is extremely rare for a non-cush pup to get CC. Unfortunately, unless the cortisol is controlled, the CC will not likely be controlled. And the only things that have the potential to truly control the excess cortisol are either Mitotane (Lysodren) or Vetoryl (Trilostane). Both are life-saving drugs for our cush babies.
Now, Cushing's is not a death sentence, even with the CC. That can make it a bit more difficult and time consuming but Ruby can still live out her full life span and beyond. So don't give up hope. Talk to her vet about getting this diagnosis confirmed and which treatment they are most comfortable using with Ruby. Get copies of all testing on Ruby from now on, the actual results, not the invoices. If you don't mind, post those results here and we will do our best to help you understand what they mean. This will help us help you a great deal.
I'm not very familiar with TCM herbs but I'm sure the Holistic vet will be willing to work with both approaches to make sure they both benefit Ruby - most are.
The pumpkin (plain not pie filling type) and yogurt won't help the Cushing's but they shouldn't hurt either so if she tolerates them I would keep using them. The flax lignans are part of a treatment for a form called Atypical in which cortisol is normal but other hormones are not (with the CC it is unlikely Ruby has this form) and is used in combination with melatonin. The flax lignans won't help the cushing's but as long as the extra fiber isn't an issue for her, they shouldn't hurt either.
A tip since you travel often - start a file to keep at home of all tests on Ruby from now on. This way should you ever need to take her to a different vet, you will walk in the door with all her info in hand. Keeping a daily diary of her eating, drinking, peeing, sleep patterns, moods, any changes you notice in behavior, and so on will also be very helpful not only to you but to her vets. This will help you see patterns that might otherwise be missed...and if you're memory is anything like mine, well...remembering what happened last week is sometimes a challenge!
Members who deal with CC have said taking pictures periodically helps them see changes with the skin too.
I'm glad you found us and look forward to learning more as time passes. No matter what you choose to do, we will do all we can to help you.
Hugs,
Leslie and the gang
"May you know that absence is full of tender presence and that nothing is ever lost or forgotten." John O'Donahue, "Eternal Echoes"
Death is not a changing of worlds as most imagine, as much as the walls of this world infinitely expanding.