Spoiler: I'm her

So I've been thinking about the dialogue in the final scene before mark finishes the cold harbor file, where Helly convinces him to go through with the plan by saying "I'm her." It seems everyone assumed what she meant is "I'm Helena on the outside" i.e. we can never be together anyway so you might as well save your outie's wife. However, I read that scene a little differently in the moment and am still not convinced she meant "I'm Helena." I'm not sure that argument would so decisively change mark's mind. I think by saying, "I'm HER," she was appealing to iMark to empathize with Gemma's situation by drawing an analogy between Helly and Gemma. I.e., Gemma is trapped, involuntarily separated from the love of her life, and someone's partner. I thought she meant think of Gemma as you think of me. You need to help her. Idk, thoughts?