If Sunny is getting aggressive perhaps a time out then reintroduction to attempt to reset her position in the pecking order may be needed. If that doesn't work then some people might try something like pinless peepers (i've never used them myself but some say they work), maybe set up a permanent...
That's a tough situation and I understand why you're concerned. Keep treating the wound as you are and hopefully it will heal, the purple stuff was probably blu-kote. If you want to post pictures of the wound that might help to determine how it's doing. As long as there's not infection- pus/bad...