[Reyoki]

Having personally had open heart surgery- and thus having my chest cut open for the operation- I can say from experience that a little leakage is fairly normal. As long as she keeps herself clean and watches for the area becoming red, painful, and/or swollen and going to the doctor at the first signs of that, she should be fine. Puss like that is probably her body's immune system killing off and expelling foreign bacteria, like when you get bitten by a bug and the bite mark will have a small pocket of puss in it. As long as you drain it and keep it clean, it will heal up just fine.