I was thinking doggy diapers, and someone mentioned a basket muzzle.... I know it's not the best idea ever but what about making her wear both (muzzle would prevent her from taking diapers off too) and letting her roam around on her own some. I too think it's the novelty of her being loose "omg cooooooooool! Yayayayayyay! I am LOOSE, whats over there, can I eat it???" But if she gradually was loose longer and longer that novelty would wear off "Oh I am loose again.... ehhh, so what?"
.... I totally get why your not really able to, but maybe with a diaper and basket muzzle she won't be able to get into too much trouble (you would think LOL). Supervised of couse, but just increase the time she's loose then take the diaper off for longer and longer then the muzzle. She sounds very anxious, does anyone know if the DAP collars really work? Depending on how bad it is, maybe even meds then try weaning them off.
I know this is a whole debate, but *maybe* the spay will calm her down the way a neuter calms down some males? It takes a while, months but one can hope. I feel for you, I know how you probably feel... found dog, no one wants it, surprise heartworms, surprise preg too, and issues. I know it HAS to be overwhelming, but you are honestly ALL that Ada has at the moment and even if they don't show it I believe that animals DO appreciate it. How would they not notice that they are no longer starving, sick, homeless, unloved, ect? I think you will find the perfect home I really do, she just needs some work first.
It won't easy but it will be worth it. (makes me think of the starfish story where the man throws the beached starfist back in the water and someone asked him "why bother when there are hundreds, what's the point?" And he tossed one in and said "It mattered to that one."
(sorry if this makes no sense, I am so sleepy right now lol)