So she can imbue holy (purification) power into swords and foods... So why can't she just use it directly on people? Or even better, why can't the knight with the imbued sword just slash/smack the people themselves? Clearly the sword doesn't harm the spirits after being blessed by her.
The whole food thing seems completely pointless and totally unnecessary, like the food aspect is just being jammed into a generic saintess isekai story... Which, to no ones surprise, since the food aspect doesn't really work in the story, this story is in fact, a very generic isekai story. It's nothing but pure sugar and sparkles, which get's old really fast.