There's actually an experimental treatment for rabies that can be administered if post-exposure prophylaxis fails (called the "Milwaukee Protocol"). It involves a drug-induced coma followed by a cocktail of antivirals, and the success rate is around 20% in the best case (n.b. the sample size for the study that figure was 10).
Not that it would have helped here, when the diagnosis came at such a late stage.
The case report for the patient treatment that pioneered the Milwaukee Protocol—the first-ever successful treatment of a rabies patient—is worth a skim, if you're into this sort of thing.