Uh... I'm so sorry! Originally, the orange giantess was designed to have a battle event where she grabs and eats you after a few turns... I'm not sure what caused it, but I wonder why the eating pattern didn't trigger...?
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To be honest, I had completely forgotten about this. But I’ll explain my experience in case it helps you fix it.
I jumped into the fight and started attacking her with the knife, but the giantess wasn’t doing anything. Then I attacked her with the torch until she lost all her health—her health bar disappeared, but she was still alive. Finally, I threw the defibrillator and she died, which kicked me out of the fight, but now her sprite was naked. Very strange, to be honest. I could fight again, so I started the battle and just defended. Then what you mentioned happened: after a few turns, she grabbed me and ate me.
Pdt: Unless you defeat her once, she will never start the event of eating you.