Ellie's incision gave her a terrible time.
It was all bumpy underneath and one of them got very large (probably over half the size of a marble). There were red spots a centimeter away from her incision. Two of her staples twisted. It drained a bit. Her incision was very long because she had a liver biopsy also... I think the vet may have used staples to close faster. Anyway, Bella does need to be seen but it might not be as bad as you are thinking, so hang in there.
By the way, Ellie's ended up being just fine and healed nicely.