Interesting that she's on antibiotics. Odin's feet were far worse than hers but our vet suggested the epsom salts and topical ointments first to try avoid antibiotics (but maybe this is because Odin was so poorly in other ways too). He said they only do antibiotic treatment once the sores are open and deep (and if there's a chance infection is in there). I would have thought Patsy's feet are no were near as Odin's were much worse and he didn't have infection.
I hope the vet has panicked you too much with the bumblefoot diagnosis (I got the same diagnosis for Odin) but it can be treated and managed - there's a lot of scary stuff out there on the internet about it!
I managed to get my Vet bed on Amazon, a huge roll of it and just cut it up to suit.
Hope lovely Patsy continues to improve. My boys are sending healing vibes