I could be wrong, but this moth looks a lot like Azenia implora and not so much like Schinia luxa to me. No Azenia implora records for OK, but it occurs in nearby SW states.

A very heavily marked S. luxa seems reasonable to me. The usual dots are in the right places.

Compare with CNCLEP00062954, A. implora. In luxa the medial line is reduced to a spot, often chevron shaped (see Jillian Cowles' MPG image), for luxa. This mark appears to be lacking in implora. The medial line of implora may be reduced to a single coastal mark which does not ever appear to be the case for luxa. In the above image there is a tiny coastal mark just beyond the well developed medial line as seen in CNCLEP00062954. Beyond that inside the pm line is a larger spot which is lacking in luxa. There is a dot on the pm line of luxa but it is further out. The am line of luxa is reduced to a single central spot and lacks the costal mark of implora. The above shows an additional basal coastal spot before the am line which I can be seen in many implora examples.

I appreciate your help!