You know, the case seems a bit odd. Here is this woman and she flags down a random car? Or was it a cab?
Probably a randon car. This is quite common in Russia. I used to do it all the time.
My understanding is that just about every car in Russia is a cab. You need a ride, you flag down a car and negotiate a price. Makes a lot of sense, economically speaking.
Obviously might not be the safest practice.