If she is up and eating she is likely just sore. You could bolster her water with a little molasas or corn syrup. A drench of coffee and sugar water might perk her up for the effort. A couple of things to consider. Did she pass the after birth? Is she lactating? Is she anemic? A couple of follow up PenG shots wouldn't hurt. 10cc's seems a lot but I really don't try to remember doses either. Better to finish what you start with antibiotics then go half way.