I have circled the spot on the bottom of the foot that is of concern, attached below, it does look like bumblefoot. A clearer picture is always better. You need to soak the foot in epsom salts to soften that scab/lesion and remove it. Alternately you can apply decolorized iodine (not the same as betadine, any pharmacy should have it in the first aid section) to the lesion and wrap it overnight, that will also soften it. Tweezers can help. Try to do as little damage to healthy tissue as possible. Then you will need to squeeze out as much gunk as possible, it may come out in small chunks or larger chunks (chicken pus is firm, cheese like, not liquid). All of it needs to come out for it to be able to heal. It can take a fair amount of squeezing and manipulation to get it all out. Tweezers can sometimes help also. Sterilize them first. Both of those swollen areas between the toes need to be emptied, they may come out the hole in the bottom, that would be optimal. Sometimes you can feel the stuff as hard spots under the skin. If they will not, then you may need to lance and clean it out from the top. Flush it all out really well with chlorhexidine (Hibiclens, again any pharmacy) or diluted betadine. Then fill all the areas with plain triple antibiotic ointment, cover with a telfa pad or gauze and wrap with co wrap or vet wrap to keep it clean and dry. You will need to check it daily to every other day to make sure it's healing, reapply your ointment, and rebandage, until you know it's healing up well. If it regenerates then that means it was not all cleaned out, and you will need to repeat that again. If you have help to hold the bird, that makes it easier, if you wrap her in a towel like a burrito and lay her on her back, they usually calm down pretty well. You can cover her face with a light cloth also, just make sure she can breathe well, that can also help. I've done some pretty nasty ones on my own, not that bad to do, just take your time.
Here is another link:
http://www.tillysnest.com/2015/12/non-surgical-bumblefoot-treatment.html/?spref=pi
Here is another link:
http://www.tillysnest.com/2015/12/non-surgical-bumblefoot-treatment.html/?spref=pi