In a foot like that, where the infection hasn't come to a head, I would apply the sugar/iodine paste(poultice), then put on the gauzepad and vetwrap and recheck and reapply the paste every two to three days. The poultice will help draw the infection "down" over time and you will likely get another scab or more of a plug that you can then remove after a soaking. The plug is the infection dried up or that scab and what's attached to it. Sometimes you find solidified pus under it, sometimes you don't. Or in your case, the pus was still liquid like. Now, this method will take a couple of weeks to come about, maybe more, but I have had some success myself using this poultice method. After removing what you find, you have to put the antibiotic ointment on, rewrap the wound, keep her caged on clean surface a few days to give wound opportunity to close and then you can let her loose and change the bandages and apply more ointment at least every three days (more often if the environment is wet). If your conditions are wet I really recommend getting the Johnson brand (other brand wont stick) waterproof bandaging tape in the 1 inch size. Slap a large piece of that on the bottom of foot on top of the bandaging and maybe between the toes. It is my understanding that bumblefoot is very "spreadable", so finding it and doing something about it is important for the rest of the flock. Wrapping the birds foot, I believe, can help stop the spread. Keeping a dry coop floor and run is another important preventative along with removing sharp objects, imo. If you free range, well, you can't keep them from scrapping their feet or keep them in dry conditions so you just have to deal with it sometimes.
Swelling can persist for weeks, but if you don't see another plug form, you likely got it. Curing bumble foot is a long process, not something that is done in a week or two. The birds own immune system helps to fight this off too, so it's important the bird gets good nutrition.