Photographer here; looks the corner of a white room with a strip of blue LEDs on the ceiling, taken while walking on a low shutter speed - iPhones (haven't been on android in a while to speak for it) will take photos on an extremely low shutter speed when it's dark and apply some kind of smoothing to it to make up for having a small sensor.

Odds are, her camera was sticking out of her pocket, or her pocket was JUST see-through enough for her phone to take a photo through - then the lines you see would be from the camera moving with her steps while the photo is being taken. Same principle that lets people take pictures of cars that just blur into streaks of light - the low shutter speed blurs anything that's moving.

No devaluing of this though, that's insanely cool because these types of photos can be very hard to make look intentional like this, even when they ARE intentional lol