Yes, I’m afraid I agree with the others and good point RossBantams watch out.
Here is my ideas with regard to bumblefoot, hope it helps;
Think of a bumble as a dandelion, it has a root. What you see is the flower and you are removing the flower but the root continues to produce more flowers…and the root grows.
So, you cannot cure bumblefoot (or kill the dandelion) without removing the root.
Surgery is the only option and get out as much root as possible not just the scab. I always found that this would leave a dent in the bottom of the foot, a dimple if you like. Fill this with neosporin cover with a dressing with neosporin on it, bandage. Keep her in a cage for a week reducing her walking. Put her on antibiotics during this week. Change the dressing and repeat with the neosporin after four days.
Release with the bandage and a week later remove the bandage with fingers crossed.
Don’t be surprised if it comes back and you have to do it again but it looks like you have caught it early so good luck.
Update - before you start fill a sink /bowl with Luke warm water and betadine liquid so it looks like weak tea. Keep her feet in the water solution for a minimum of 20mins to soften the scab. Also do not just remove the scab remove a little bit of skin, slightly, around the scab.
Bon chance