They would get match time at house shows most likely as I once sat through a 12 minute Bella vs Eve and Kelly tag match when Brie was champ. Not saying that would appease them but it would cushion the blow with the cash they could make. They also would be used more regularly than a drone like Gail who just couldn't get over in WWE
Like Salinas said, TNA is what she loved. Wwe however is what paid all the bills up before time, kept food on the table, and so on. It isn't that simple a decision if you have plans for a family, house, car, and just security in general from the recession
You also have to think about what if I get hurt. TNA has a history of not covering medical expense. Wwe gives you a downside so you know a check (smaller than being on tv mind you) is coming every month, and they pay for surgery and rehab/therapy. Both girls have been lucky but it is a high risk business