Please clarify
as to what you mean !. If she already used her AP while traveling, how could she show it again...
Do you mean that she was on H4, applied for EAD/AP and never used AP. But while coming back the officer asked for AP. If the officer asked for AP and used it to parole her in, it could be an indication that your case has already been adjucated.
I did speak with my lawyer regarding what happens if the I485 gets approved while you are traveling abroad. She mentioned that while one should get the stamp at the earliest, there may not be a need for doing so right away. You could be paroled at the point of entry and then go for your stamping.