Rabies is treatable, at least in the early stages. It takes multiple painful injections, and they usually don't do it for animals, but Momiji's a youkai so she should be fine.
Once the infection starts to show symptoms, the affliction has already reached the brain
Farewell Momiji, you were beautiful to the end.
HffffHfffffAgh!Feels like I hit a ball of lead!Ggh!Why!?ViiingggShe used an offensive spell card on herself!?On OneselfDog Sign: "Rabies Bite"!!M-...Momiji?Her serve got faster!?Effect of the SignThummPasshtZrakkSway