What is water toxicity due to which a 35-year-old woman died in the US?

A 35-year-old woman named Ashley Summers died due to water toxicity in US' Indiana. Water toxicity, also known as water intoxication, occurs when someone consumes too much water in a short span. The condition arises when kidneys struggle to handle an influx of water, leading to imbalance of electrolytes. It can decrease sodium levels, which could result in brain swelling.