Multiple excuses- food in the freezer/fridges (which can't be salvaged for more than a day with the generator, not without burning through a lot of expensive fuel), pets, the fact that her younger brother has a brick home she can ride out the actual storm in...

The truth is, she just doesn't want to leave. She doesn't like travelling anymore- she's 92 years old and her feet swell up if she sits in a car or plane for long periods of time.