I saw her crashing his attempt at suicide\sacrifice as more along the lines of her version Patton’s remarks before leaving for Africa in WWII ; “No dumb bastard ever won a war by going out and dying for his country. He won it by making some other dumb bastard die for his country.”
She’s just not as blunt about it.
She clearly has feelings for him but she also explains her reasoning with something along the lines of that’s how we’re going to win.