Much love to you for working so hard to try to ensure that your snake is healthy and happy.
I have another suggestion for you if you are open to it since you've narrowed down possibilities for her issues as being potentially behavior/exercise-related. I am friends with Lori Torrini, a behaviorist and trainer who works with a large group of snakes. She and her husband also run an animal sanctuary on their Colorado ranch. It's her veterinarian, by the way, that I would have referred you to if you felt you wanted a veterinary consult.
Lori's focus is on helping keepers learn about how best to respond to their snakes' behaviors and provide an enriched environment and behavioral choice leading to increased quality of life. She won't give medical advice but works very closely with her veterinarian, who is outstanding.
Lori has a few decades of experience with behavior and training of multiple species from pets to zoo animals, and is a very kind person to deal with. I'd really encourage you to consider some phone consultations with her; she will also work with you and your snake on video if you like. She'd provide a great home for your snake should you decide to surrender her, but honestly I'd rather see you able to resolve these issues and keep her (if that is your preference). Let me know if you are interested and I'll put you in touch with Lori. If you want to get a feel for how she works and how she interacts with her snakes, she has a YouTube channel that you can search for just using her name.
You may be right that you need to ultimately make a choice between dog and snake, but I am not entirely convinced of that. It's very possible to provide a lot of enrichment to snakes without necessarily spending a lot of time doing it.
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