The two-year-old female has moved from Longleat to Woburn and is settling in well, her keepers say.
A red extreme heat warning remains in place until Friday evening.
People living in parts of Northamptonshire and Bedfordshire report their taps running dry.
Nettie Edmonson says "I genuinely haven't thought they might be worth some money".
The park says the animals have been "peacefully put to sleep" due to age-related health conditions.
Greg Rutherford, whose son is autistic, hopes other venues will follow Woburn Safari Park's example.
The stately home has put the Claude Lorrain masterpiece on the market to fund restoration work.
Heating issues cause schools to close as temperatures plummet.
Police say they do not yet know the full circumstances behind the accident.
