The Eye cannot talk to me directly but by using everything its possessor had, it was desperately conveying how it didn't want to perish along with her.
If it could speak, it would probably say something along the lines of 'Spare her. She'll be of help to you!'
Maybe that pillar it sent down lacked the power to kill me. However, at the very least, it would weaken me enough to blow the wick on my thought of taking the path that involves killing the troublesome woman.
It's sly or it's simply that selfish. If it just wants to survive, it can just offer to be gouged out of the woman's eye sockets, no? Nah. There's probably a limitation to it. No matter how mysterious it was, it was bound to her.
Transplanting that pair of eyes to someone else won't make one its new possessor. Hence its desperation to keep her alive.