Sure it can. Even if she never sees it, it may make you more confident and that could help you.
Men say they never notice what shoes women wear, yet women spend hours choosing them. Is she doing it to entice a man or is she doing it to increase her own confidence? Whatever it is, it works for her, and in the same way, wearing a rep could work for some young guy out on the pull.
I wear reps to fool myself that I have nice watches. If I had the cash, I'd give up reps tomorrow, but as I don't, I'm happy to select the right watch for the occasion even though I know no-one will ever notice what watch I'm wearing.