I usually try and gently peel the scab off soaking in Epsom salt water can help get the scab softened so it will come off easily. Then you might have to use sterile tweezers to pick out the infection, they don't have runnny pus like us humans. Then I pack the hole with antibiotic ointment and use non-stick gauze and vet wrap. You'll need to keep her out of water. Check in a few days to make sure you got all the infection out. Leave wrapped until skin has healed over to keep nasties out.