Is Queen Elizabeth2 mother still alive?

In 2008, Queen Elizabeth's mother died of suffering a extremely violating cold for four months and the funeral was located at Royal Lodge, Winsdor Great Park. Elizabeth grew camellias in every one of her gardens, as her body was taken from Royal Lodge, Winsdor to Westminster Hall - to rest in peace in an extremely high honour only bestowed once before, next to King George V's lying in state