Linda, you have a kind heart.
I would have done the same thing. I hope that Monarch survives but at least you know you did the best you could. Butterflies sometimes have a hard time when they are under attack by other B'flies, lizards, birds or whatever. I took this photo last summer of a Gulf fritillary with a chewed up wing. He seemed to be okay even with that huge chunk out of his wing and I actually saw him feeding on the Echinacea's for a few days.
I was moving my plants out on the deck today, rotating some to more light. I was moving a large pot that's on a wheeled caddy and apparently there was a tiny lizard underneath the tray or something. It must have jumped off the pot/tray as I was moving it and one of the wheels ran over the baby. I picked the itty bitty thing up, petted it and told it I was so sorry. It was still moving so I laid it at the base of another plant on top of the bark mulch but I checked later and it was not alive, so I buried it beneath the plant.