wife's 485 filed after husband's 485 got approved

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Here is a timeline of events that happened:
- Went to Nepal to get married in March while I was on H1B. My 485 was pending waiting for an RFE to be submitted before April 02.
- Returned back with wife on Mar 23. She came on H4.
- Mar 26, I sent the response to my 485 RFE.
- Apr 01, my 485 was approved.
- Apr 05, shipped wife's 485 employment based petition.

As I understand USCIS should receive wife's 485 application before my 485 gets approved. So, I'm guessing H4 is now cancelled. I know that there is a grace period of 60 days for H1B and H4.
Is there a chance that USCIS will give us a receipt within 60 days of Apr 01?
Or can't we use that grace period and wife has to go back to Nepal for Consular Processing?

[newacct]

There is no "grace period". Once you became a permanent resident, you immediately lost H1b status, and your wife immediately lost H4 status. However, she can file I-485 in an employment-based category as long as she hasn't been out of status or illegally working for 180 days since her most recent admission.