She is 26yrs.old now, was married to a us citizen in 2007 and shortly after applied for citizenship. Her residency was mailed in 2011 and was never received.
Since you're asking this on someone else's behalf, it is very difficult to give you a good answer as there is a lot of information necessary. If she mailed a residency application, but never received anything then she is not a resident and cannot apply for citizenship yet. If that is not the case, please get more facts (when did she apply for a green card, was she approved, were conditions removed, has she applied for citizenship, is she still married to a US citizen, if yes is it the same person she got her green card through if she has it, etc. and when these things happened at a bare minimum) so you can ask a specific question and get a better answer.
Please do not confuse legal permanent residence with US citizenship. Confusing the two can result in a false claim to US citizenship. A false claim to US citizenship results in deportation and a permanent bar from the US.
You should retain an experienced immigration lawyer to review all the facts, advise you, and handle the case. You can find one through http://www.ailalawyer.com.
She needs to file an I-90 Form to receive the green card you are saying she never received until now, most likely because she changed her address and never properly notified USCIS as she was supposed to.
I suggest that before filing the I-90 she schedule an INFOPASS appointment at her local USCIS district office to understand what really took place.
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