Factual error: The rabbits are underneath the landrover, and they get shot out the back whilst holding on to the axle. Land rovers have an enclosed axle with a hub enclosing the diff, so this would not be possible.
Factual error: Thomas McGregor asks at the station in London for a 'round trip' ticket to Windermere. It's called a 'return' in Britain and no British person would ask for anything else.
Chosen answer: Because her house was smashed with a tree.