She isn't wrong about it being a legitimate tactic. You might not like it, it might make you a piece of shit for doing it, but it is a completely legitimate tactic.
Definition 1: maybe, although even that may be borderline, since these unsubstantiated suits sound pretty vexatious (IANAL).
Definition 2: no way that this is justifiable, or that this peculiarly broken aspect of the US legal system — where you pay your own costs even if you win — can be defended with logic.