You're thinking too deeply about this. Elephant breh killed her for revenge. Maybe her spouse or fam killed his or 1 of his you never know.Assuming the elephant attacked her on account of past grievances, that can only be true if the elephant is at least in its 40s. Nobody much older than their 30s would have the physicality to bully a small elephant.
That being said I'm still sceptical a woman from a village in India would have the physicality at any age to bully a small elephant. Village folk tend to be living in borderline poverty, they don't get the most nutritious diet and they tend to be much smaller in height and muscle mass than the average western person because of that