I wonder if the individual airline can deny her future flight/tickets and simply do what casinos do: claim she is persona non-grata? Also, casinos share this information. Maybe the airlines should create a "black book" to protect their investment and safety?!
At the least, the airline should sue her for the diversion. In my estimation (I'll let the commercial pilots chime in on this), that diverting a flight, landing, delay, fuel, fuel tax, gate tax, landing fees, etc would be north of $100,000.00?
Which is not far removed from hijacking.