I’m so sorry that you’re at this cross roads

it’s never an easy decision to make, but you’re making all of the right considerations and you’ll choose the right decision for you and her.
If it’s any help to hear, my Fiona, pictured in my profile, had pendulous crop and I tried everything to cure it. Her breast feathers never grew back but she was such a sweet girl and total fire cracker—loved being held and eventually regained enough confidence that she wasn’t lowest on the pecking order. I know chickens can hide their ailments well, but she really adapted to life with pendulous crop and kept up with the rest of the flock. I’d occasionally find her puffed up whenever her crop got really full, but otherwise she was quite lively and resilient! She lived to be 1.5 before she disappeared one day, unrelated to her crop. Molts seem miserable for all chickens, but maybe she’ll bounce back after she’s done molting?
Good luck! Sending you lots of love