Gas the rat (CO2). Sooner or latter feeding live adult rats will bite you. Bite you as in your snake losses an eye or worse.
Since the rat got the better of your snake, let her have some time off. Treat the wounds to prevent an infection. When she acts hungry, gas the rat or break its neck. Use your tongs to hold an wiggle the rat.
Now, for those that say "snakes eat rodents in the wild all the time without injury". I say "they" are wrong for two reasons.
First, wild snakes ambush the prey in a larger area then a cage/enclosure. If the rodent gets loose it can run away. In a cage it has to fight or die.
Second, wild snakes get injured an it leads to death because of secondary infections. While stationed in Panama I'd find messed up snakes. The older guys always said it picked too big of a meal. Fer-de-Lance, Bushmasters an Boas with one eye wasn't that uncommon. Heck, you'd find a dead young Fer-de-Lance near a dead cat or coati.
Keep your snake safe an happy, kill the rat.