How big is she? She looks pretty large, but I found with the tiger I had in the past worms needed to be smaller than I'd normally do for rays of similar size. That said it was an issue with the tiger getting them down, not so much the digestion side, so it may not really apply. If yours is taking them down ok I wouldn't think whole worms would really be an issue, but it is possible.
So this is where she went....Never seen a worm or any foods go all the way through digestive track and not be digested. Was it still whole when you removed it?