Just throwing up our hands and saying "we simply need Facebook" doesn't help anyone, and doesn't help to fight the pernicious effect of Facebook's dominance. I agree though, that some kind of regulation is part of the solution--but not because it's some kind of essential utility, but because of it's ill effects (like smoking).
Despite her initial fears about being so dependent on it, this might actually have been a blessing in disguise--just the encouragement she needed to let go and move on from this harmful platform.