As the rule of N-400 indicated, if a PR spend half of 5yrs in the US, he/she can file N-400. Since she stays 2009-2011 and half of 2014, I think she qualifies for N-400 submission.
So if she file on her *own* N-400, does my immigration status (PR, keep traveling back and fro 4-5 times a year)...