Catching this thread a little late but I'm glad Sowa will be okay. I thought it looked like an abcess too, glad it's nothing. Glad the vet didn't charge you anything, didn't they owe you a free recheck after the surgery? We always get a free recheck anytime we go in for a problem.
I hope Sowa will give you a break for a while, seems she's putting you through the mill , guess it's normal to worry about our dogs, I'm just as bad.