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I can see where some birds may be a little more stuborn about kicking the habit, my thought's are this from what you posted.
Your water isn't cold enough................. have enough water to fully emmerse the hen to the head, and make that tub filled with 2 bags of ice.
Second you may not be holding her in there long enough or improperly, hold her in there to the head keep her wings open but keep her from thrashing, you may need another set of hands. Keep her in there for 5 minutes the next time.
When you take her out put her somewhere like a cement slab or some sort of improvised cage for an hour, then dunk her again, do this for like 4-5 times in just a few hours.
Sometimes you just have to get a tad bit tough mentaly, if your not up to doing that OK that's fine, but you still gotta live with a broody hen. Putting the hen in some cold water isn't cruel despite what is sure to be an outrage to some pet chicken folks, but as the thread attest to it does work. keep trying you will get it just get tough and if the hen wins the battle, you may want to rethink your animal husbandry ideals, it ain't rocket science. Good luck to you.