Eloise Mintumble dies in a time-travel experiment

She is trapped in 1402 for a couple of days. When the Ministry researchers manage to retrieve her, her body ages centuries on her return and she dies shortly thereafter in St Mungos. The effects of her disruption of the time stream are severe. Twenty-five people in the present simply vanish, having never been born. The following Tuesday lasts for two and a half days, and the following Thursday only a couple of hours.