(ii) Separation -
(A) Legal separation. Any legal separation will break the continuity of the marital union required for purposes of this part.
(B) Informal separation. Any informal separation that suggests the possibility of marital disunity will be evaluated on a case-by-case basis to determine whether it is sufficient enough to signify the dissolution of the marital union.
(C) Involuntary separation. In the event that the applicant and spouse live apart because of circumstances beyond their control, such as military service in the Armed Forces of the United States or essential business or occupational demands, rather than because of voluntary legal or informal separation, the resulting separation, even if prolonged, will not preclude naturalization under this part.
It is unreal how you can think that a trip of 90 days means the dissolution of the marital union, despite all the evidence in favor of a real genuine marriage. The text is pretty clear to me.
It is pretty easy to prove that my country did not let Americans in during Covid. It is also easy to prove that my spouse did not want to travel because of Covid. It is also easy to show the legal papers done during those 90 days.
Further more, a trip home is not a separation that suggest a marital disunity! It is indeed a separation meaning that we are not in the same house but nothing else.
For you, if your spouse visits her family in another state and you don't join it means you are in a marital disunity...
I will come back with details after the interview.