She said she did it in error. She was apparently supposed to get into a car booked for her but got into a taxi instead.
What's the relevance though, why bring it up in a police statement? It doesn't seem that relevant to the kidnapping. I feel like it's to explain away some sort of hole in her story.
There will be records of flights, hotel stays etc. so if she is telling the truth it can all be verified I guess.