Y3+E

If it was me, I would overwhelm them with evidence at this point because: RFE = a second chance to complete your case. NOID = a last chance to save your case from denial. What submission instructions are provided in the NOID letter? I could not discern this in your previous copy and paste. My understanding is If your case was filed online and your USCIS account lets you upload the NOID response, yes—you may submit your final PDF through the portal, and it will count as timely if uploaded before the deadline. But if the NOID notice specifies mailing, you must send it by mail. When in doubt, submit both online and by mail with a clear table of contents, to ensure it’s accepted. I would mail a hard copy (with tracking and delivery confirmation dated before the deadline) for extra protection. That way, there’s no risk of USCIS later claiming they didn’t receive it. This could be your last chance to submit additional evidence.

If I received your advisory notice, I would have simply understood that the evidence I provided to date is "seriously" inadequate - thus the serious warning. I would learn from this. I would gather as much evidence as kindly suggested, and and submit it. Whoever advised you to submit additional evidence did you a bigger favor than you realize. Whatever evidence you gather in response to this warning will save you many hours in the future. You will have to submit the exact same evidence AGAIN when you to submit your I-751 (to get her permanent Green Card). And, you will have to submit this exact same evidence a third time, when you submit your N-400 (for her Naturalization). Save copies of ALL the evidence you assemble.