You didn't say which Disney park.
Peter Pan's Flight is in four Disney parks the original
Disneyland, the Magic Kingdom at WDW, Tokyo Disneyland, and Disneyland Paris. In each of these parks, Peter Pan's Flight was one of the original attractions and continues to be in operation today.
Perhaps you friend's mother went to one of these parks when the ride was temporarily closed for refurbishment. Even then, it should have been easy to find the attraction on the park map.
Also, there are plans to add Peter Pan's Flight to Hong Kong Disneyland.
Peter Pan's Flight is very popular. In each park, it typically has the longest lines of any of dark rides in Fantasyland. There's something about the ride that captures the imagination and invites repeat visits.
I really wouldn't worry about that. Peter Pan's flight isn't Superstar Limo or Timekeeper.