Besides the question about whether she even has ABS...

If she locked up her brakes, I would be surprised if the car slid straight. More often the car starts rotating as the rear tires slide sideways. That's sure to be memorable if it's the first time it happened to her.

What about the brakes being wet? Wet pads & rotors from road spray, if she hadn't used her brakes for a while before this. Imagine brakes on a bicycle during the rain...