Ouch. I'm not a doctor, so I'm often under wrong impressions (but then again, so are doctors); I would check the medical literature itself. Again, if the doctor says its benign, don't worry about the rest of the details; at least for the cancer I had, the division between I and II was the circumference of the malignant growth (and in that case, it's a genetic disease that causes a benign growth that sooner or later turns malignant). They might be classifying benign growths similarly.
My (possibly flawed) understanding is that class III ovarian cancer is subdivided into IIIA and IIIB. I imagine cervical cancer's the same.
In my aunt's case, they didn't know whether it was benign or malignant until they operated, at which point it was classified IIIA (metastasis to surrounding organs). Six months later, after chemo, she's doing well, and the cancer's stopped spreading.
If they're telling you II and III, odds are they either haven't found any evidence of metastasis (ideal), or what they've found is just beginning, in which case it will respond to treatment. Plus, the fact that this was found on a routine checkup helps immensely.
Whatever you do: A. Don't listen to survivability statistics. Remember that those are based on when the cancer is detected, the attitude of the patient, and other factors that don't apply. Many patients aren't diagnosed with cancer until they're dead. Others are diagnosed late in the game. Others do things against medical advice. Some may die from other factors (since these things tend to hit older people). So if someone gives you a set of months or years, or a percentage for survivability, understand that's the far lower end. Besides, an optimistic attitude plays a major factor.
B. I don't need to tell you that cancer (or the threat thereof) involves family and friends. Be there.
C. If you get lucky, and it's benign, you've still got a family member coming out of major surgery. We know you'll be there for her.
D. Also note that cancer is one of those words in the english language that is rarely spoken, but usually involves euphemisms ("malignancy", "tumor", "long illness", etc.). That's because it's really scary. I prefer to face my enemies. MAke your own call.
My thoughts are with you and your family Tac.
Good luck.