Tarmack
Rhetorical Porcupine
If she is given a product for free or at discount rate though to review it she has to state so in the video either way. Someone could pay you for the video as well but they need to go through google on that method.
Does a movie reviewer have to disclose that they didn't pay to get into the movie?
You're adding a layer of complexity that is not required. A free product to a reviewer is not a "benefit". It's work. They're giving you work to do. Think of it from a business perspective, not a individual just starting out and getting free stuff perspective.
It's a good idea to disclose anything that might influence your opinion of a product, but that's for your audience.