

She probably used it earlier, but not necessarily. She might not have a good place to set her phone in her car.
She might have used it earlier, at a time where it was legal. For instance, setting navigation or music before driving. Or (depending on local laws) while stopped at a light.


Entrapment has a very specific definition, and this ain’t it.
It might still be an illegal speed limit change, but that’s going to depend on an awful lot of details. It’s certainly bad design, but the locals probably like it for the money it brings in.