TNA Wrestling continues to look at bringing in newer and cheaper talent, however, until their domestic TV situation is sorted out, contracts are not being offered.
Havok debuted without a contract. The company is high up on her but until they sign a domestic TV deal, they don't want to commit any longterm money, even on small scale deals. For now, she's working night to night.
The Knockouts division is extremely political right now, especially because there are so few spots. The existing girls on the roster typically do everything possible to keep new girls out as they don't want to lose their spot to someone younger. With Havok's look and style being so different, the girls don't feel as threatened by her, so you don't have the normal "sabotage" going on that you have when TNA is looking to bring in a new girl.