If she ate both, she might have an infection that spread despite the first arm. If she lives you can hand feed her so keep trying. I have found that the key to preventing these sorts of things is a clean cage with not too much water and VERY moderated heat. I didn't account for the weather and couldn't get my bug room below 80 for a week or so and it killed my asian mantis due to infection and gave my budwings cottonmouth.