Travelling on Advance Parole

[Y007]

My wife and I filed our I-485 application in October 2001.
The current Status is:
AP - approved for both
EAD - pending
AOS - pending
We have an important question about using the advance parole. My wife was on an F-1 visa (optional practical training) when we filed the I-485. Her F-1 visa expires in May 2002. She plans to travel to India sometime in March and may have to stay in India until August 2002, due to personal reasons. Her advance parole is valid until Dec 2002.

Our concerns are:
Is it ok to be out of the country (US) for a period if approx. 6 months, using the advance parole?
Is it ok for her to travel on advance parole even though her F-1 will expire before she returns to the US?
What is her current visa status?
What will it be when she returns to the US?
Is it advisable for her to travel to India as mentioned above, given her visa status and I-485 status?

Has any one been in this situation before? Please let us know the pros and cons of travelling so that we can make a decision.