I think you made the right decision here in not operating on her right now. It shouldn’t be a hurried affair and your decision to leave it just for that reason was good. Lots of chickens live for a while with a bumblefoot, she is likely to still be here when you return. Second, you should be around for post-surgical wound treatment. Cleaning and dressing changes are very important to prevent further and possibly a more dangerous infection.
I would encourage you to consider less painful and less invasive measures first though, to soak every day and then wrap with the anti-pressure foot wrap, over several days, softening the scab and outer plug, and letting her weight around the plug help to work it out, which lets the hen heal from the inside out.
This takes time & care to do. I have not had a case of bumblefoot here so I’m not speaking from experience, just from what I’ve read. Sometimes this way is not ultimately enough and surgery may be necessary, but if you do a bit more research you’ll see that surgery doesn’t have to be the first treatment.