Received "Request for evidence" after i-485

flagman

Registered Users (C)
USCIS is asking about evidence to establish that my wife maintained her non-immigrant status since her admission on June 2016 till May 2018 when I-485 was filled, together with new medical exam.
Medical exam is not a big deal, but what kind of evidence can I submit? Once she came to the US she never left, so no new I-94s. She's housewife, taking care of our kids, never received any benefits, my income is pretty high. The only things we've done were SSN number card and Driver's Licence. We can submit school letter for our elder kid(10yo) and copy of birth certificate for younger kid 6m.o.
Any other suggestions?
What time of status maintenance proof they want for her? Stamp in passport says indefinite admission.

Also, we submitted two I-485s for her and our elder kid, but they've sent only one "Request for evidence" for her.
Fees are paid, biometrics are done.

She admitted to the US as the wife of permanent resident thru Asylum. We were married at the time I filled for Asylum.
I'm still GC holder, 4 months till 5 year mark.
 
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