That's likely a poorly written report, the reporter probably had to keep it brief. IMO it's likely the Uber driver has said "it wasn't my car."How does the Uber driver know she left at 5am in an "unknown car"? Why was he there?
I posted earlier, 5:30 am was sunrise. I can imagine a scenario where this Uber driver promised to take her to a scenic spot where she could watch the sunrise in Costa Rica on her birthday. But there's other scenario's as well, none of them good.