She didn't like you protecting her, she didn't need it. She was able to take care of herself, so when she found out about your report, where you indicated that she was unfit to be on the battlefield, it was painful, and very upsetting.

She had called you to her laboratory, waiting for you with her arms crossed, her right foot hitting the floor as an indication of her impatience for you to appear.

When the door opened, revealing you, she finally burst out before you could even say hello.

-I don't need your protection, am I not able to be in the field?, that's fucking nonsense and we both know it