Unless you had a very ad hoc wedding ceremony, or a quickie wedding in Vegas with whomever happened to be on hand, the marriage ceremony itself might cast a significant shadow over your spouse's intent when she married. In many states there is a short waiting period between the application for a marriage license and its issuance, for the purpose of discouraging marriages that might otherwise occur on a whim. What state were you in when you married?
The misrepresentation at issue is not really that of intent to marry, but of intent to immigrate. Had you married but not petitioned for AOS, this wouldn't be an issue. Lots of married women pursue graduate degrees - I don't see how her continuation of her education is significant and, were she in fact intending to drop out if she married... she's now married so she would have dropped out. But if you've represented to the immigration officer that not only did your fiancée enter without intent to immigrate, she also had no intent to marry, any evidence of intent to marry that is inconsistent with your story would now indicate that you and your fiancée were not truthful - wedding chapel reservations, travel and hotel reservations for family members attending the ceremony despite living in other states or abroad, when the wedding rings were purchased, etc., if made before your fiancée's entry, can all suggest deception.
It would be sensible to consult an immigration lawyer.

