Ruby knows that you'll do what's necessary to spare her pain and fear. If the treatments aren't helping, they are doing nothing positive for either you or Ruby...but I don't really agree that it's a "simple decision". I think it's just as tough as the final one.
Good thoughts from me that Ruby will be able to achieve some degree of comfort without the extended vet visits.
(I've used a holistic vet in the past...feline asthma, canine seizures...herbs, acupuncture, and chiropractic.)