If your wife is seeing white stuff coming from her private area it's a good chance that she has a UTI or a Yeast Infection and her best bet is for her to go see her Ob/Gyn to get treatment.
It sounds like a yeast infection caused by antibiotics that she was probably taking for PID. When you kill the good bacteria with antibiotics, you can get a yeast infection from the imbalance. There are over the counter medications you can try for yeast infection. If it doesn't work, then she should visit the gyn. good luck