what hapens to petra in chapter 14?

During one of the battles Petra takes her force out too far and looses sight of the others. She makes a mistake, looses most of her fighters and falls apart. As they carry her out of the battle room Ender can hear Petra screaming,

"Tell him Im sorry, I was just so tired, I couldn't think, that was all, tell Ender I'm sorry." We later learn, when Mazer speaks to Ender, that Petra will recover.