After three years in lawful permanent resident status, she was eligible to naturalize as a US citizen. The general rule is that an alien must be a permanent resident for five years before becoming naturalization eligible, but the spouses of US citizens need only wait three years. (VAWA approved victims of domestic violence need only wait three years as well.)
We prepared and filed the naturalization and I attended the interview with her at the Santa Ana office of USCIS. Everything went smoothly and the case was approved on the spot. Now, we are waiting for the oath ceremony notice.
Once she takes the Oath, she will be a US citizen. She wants to petition for her elderly mother to become a lawful permanent resident, so we will likely file that within the next few months. The total processing time for a consular processing case is about 8-9 months.