Visible crew/equipment: When we first see Francis, a helicopter lands. A large film light is visible reflected in the helicopter. (00:04:45)
Visible crew/equipment: After Colossus and Negasonic Teenage Warhead leave the manor, the scene cuts back to the bridge where several gunmen are shown exiting cars and begin approaching Deadpool. In one of the shots during this, a gunman is shown exiting the passenger side of a car, with the camera placed behind him. In the shot, the reflection of a camera, cameraman and boom mic are visible in the wing mirror. (00:10:15)
Visible crew/equipment: In the opening fight in the vehicles, Wade looks at the SUV pulling up alongside. As it does, the camera recording from his point of view is reflected on the door.
Answer: Yes that would be how she most likely was able to tell.