Advanced Parole question

[E&I 2]

My fiance will have her K1 interview soon, and so we are trying to plan out the details of her flight here. However, a detail about this confuses me. The K1 visa allows her to stay for 90 days. In the 90 days we get married and apply for the adjustment of status, paired with advanced parole and employment authorization. Getting the AP takes 90 days. This means that there MUST be some time she will be in the US after the K1 expires, but her AP has not been granted yet. In this time, how is she legally allowed to be in the country?

[Adam&Allison 128]

I believe once you file for Adjustment of Status, you enter a new period of authorised stay whilst the AoS is being adjudicated.

[A'n'L 735]

Once she has filed i485 and has the acceptance letter, she is in a period of authorized stay - awaiting adjudication of the AOS application. 

 

If you are delayed beyond the 90 days in filing AOS, she is technically illegally present. However, that is automatically forgiven once AOS is filed/approved due to her marriage to a USC.