Actually, in most states (26) this would be a very risky proposition for NATS and Co. In California we have Anti-SLAPP laws that would allow her to hit NATS with a counter claim, even before she has to answer their complaint indicating that their lawsuit is an attempt to prevent her from exercising her constitutionally protected free speech rights.
If she wins, they pay her attorney's fees. It also stays the underlaying action until the Judge assigned rules on the Anti-SLAPP motion.
http://en.wikipedia.org/wiki/Strateg..._participation