Technically, she would not be entitled to Sky Priority, but an agent may give it to her. (YMMV) Without having applied for Pre-Check, she may still get it randomly, as they still seem to be doing that. Again, not much you can
do in advance. If she is on an award ticket, she will not be entitled to any companion upgrades (since she has no status). Companion comp upgrades to C+ are only when you are on the same PNR. Upgrades on NYC/LAX routes are pretty rare anyway.