This anecdote is a good example of gaslighting because it appears that the parents are aware of the facts, but intentionally deny them, making her question real

This anecdote is a good example of gaslighting because it appears that the parents are aware of the facts, but intentionally deny them, making her question reality. The problem arises if the parent honestly believe in a different set of facts, in which case it is not intentional and hence not gaslighting.