Can I travel to India while H4 Extension Processing?

[AmbarishJana]

Hello Guys,
My H1B and wife's H4 dependent VISA are going to expire on 30th April, 2017. I will be apply for H1B & H4 (for wife) extension on 1st Feb,2017 in premium through my employer. My wife has to go to India for some family urgency on 16th Feb,2017 which is at the time of processing of her H4 extension. I will be in USA until get  my extension approval,  then go to India and come back with new stamping. So, my questions is -

1> Will her H4 extension be considered as abandoned? If so, how USCIS get to know that she is not in USA? Do I need to Inform USCIS for her travel and abandon H4 extension file?
2> Should I file her H4 extension, as i know she might not be fully available while processing?

3> Can we both stamp of our VISA when I go to India with my H1B approval only? Is stamping possible through DropBox?

Advance thanks for reply.

Regards,
Ambarish

[adshah84]

You both can get your visa stamp with your H1b approval only. 

For dropbox eligibility check below link

http://www.ustraveldocs.com/in/in-niv-visarenew.asp 

[AmbarishJana]

Thanks adshah84 for post.

We will return (10th May) to USA after our  current VISA expiry (30th April) with new stamp. Do I need to file H4 extension for my dependent once we enter in USA with new stamp?