Very long shot - UK rental in Buckinghamshire

This is a serious long shot but if you don't ask...

My Sister who lives just outside of Princes Risborough in Buckinghamshire, GB came home to find her loft water-tank had collapsed and so the house is completely flooded. As she's a single mum of an 11 year old, she needs to find a short term rental nearby until the house is fixed via the insurance (who will cover the accommodation costs).

Just wondering if this incredible community has a property or knows of one in the local area (little one still has School and it's his last term before 'big school' so fairly important to him)? We are researching agents and airbnb but there's not a whole lot in the area (found one that is £56k per month.... yes you read that right!!).

As I mention this is a real long-shot and I really appreciate any help