I think that your best bet would be to start shopping her skills and contacts to the immediate competition, then take their customers and shove it down their throat.
If she has a good record with other companies from a competitive standpoint, the above is what I would do. She has no allegiance to the former company, move on and then start procuring business from her old contacts.
One thing that she does know is the cost structure of her old place. Knowing such can REALLY put the hammer to the old place if you know what I mean when it comes to bidding!