I'm just wondering if there is one (or maybe two) benefits she could benefit from; in terms of making Avios redemptions.

Is there a way you can use your status to redeem for V class; and for priority rewards, for other people/people in a Household Account. I'm not sure.

Otherwise, as you say, your benefits do not propagate unless, of course, you're a Gold Guest List member and nominate her for a companion card.