From All-Star comics 72: 5 pages.
The JSA fights Thorn in an effort to keep her from killing a Keystone City judge when Wildcat gets overconfident and tries to take her out himself. Unfortunately for Cat, Thorn poisons him before he has a chance to scratch her and ends up needing medical attention. While the JSA worries for the safety of their comrade after learning that the judge from earlier died from the poison, the doctors point out that the only chance they have for saving him is to get a sample of the poison that was used on him, and the Icicle's freeze ray gun from an earlier encounter. Green Lantern decides that the JSA will go after thorn and that Huntress should be the one to retrieve the freeze gun since shes' the only other member of the group with no special powers. Naturally this doesn't sit well with Hunts.
Thorn takes out both Flash and Green Lantern and escapes, but not before Power Girl manages to get a hold of one of her poisonous thorns.
Continuing on from All-Star Comics 73: 6 pages.
Green Lantern decides to check up on Huntress using the ring's beam on the telly and sees that Thorn had recruited the more villainess Huntress to take out her namesake. Green Lantern realises he made a mistake sending baby Huntress to fetch the freezer gun by herself and goes to her rescue.
This story proves that Paula Brooks had two things working in her favour: (1) this Huntress was raised by Batman, and (2) she attacked Helena very early in her career when she was still a noobie at the whole superheroics lifestyle.
The alternative would have meant this fight would have been over the minute Helena got a hold of that gigantic axe dangling from the ceiling, or some other equally blunt object. Or heck, even a more experienced Helena wouldn't have loosened her grip on that neck until she passed out.
And for anyone who was expecting a battle between the two Helenas, I too deliver:
In a fight between Helena W and Helena B, I'd put my money on Helena W outsmarting the more impulsive Helena B. As unpredictable and excessively violent as Helena B can be, there's no denying that Helena W would have learnt the value of using strategy with opponents like these (and even moreso if she had Batman for a dad).
Then again, I don't honestly see these two ever fighting unless they found themselves in a situation similar to the JLU episode Grudge Match, then that'd be an interesting fight to see then.