The critical element here is that she has not taken it to a vet... she will have the say as to whether or not it gets euthanized. So she is refusing medical care for an animal the desperately needs it.
If the only thing the vet could do would be to minimize its suffering, then so be it.
But this arrogant fool is doing nothing to it. That equates to animal cruelty.
And if she is so certain that ANY vet will euthanize it, then she knows that it is beyond repair.
Bruce