Did she have sutures that require removing or dissolvable ones? Normally after 14 days after a Spey they can resume their normal activities providing the incision site has healed nicely, no redness, discharge or swelling :)
I wouldn't recommend home treatment. Best option would be to take Logan to the vet. Ideally you would want to surgically treatment for the best outcome, but if money is an issue perhaps trial anti inflammatorys and antibiotics first. if the abscess ends up bursting, use diluted betadine to clean...
I haven't seen it in a rabbit but I have in dogs after sterilisation. It's like a haematoma seeing the testicles are gone. The swelling will take a while to go down eg a week or 2. Metacam will help with the inflammation though :)