Hooray for caterpillar rescue!
Patti, I was reading about your butterfly and it's in the same family as the Cloudless Sulphur and some of the White butterflies we have here in North America. Except I think you got the better end of the deal! I thought they were much bigger based on your picture but maybe that's because they're so showy. It's bad enough I have plant envy; now I have butterfly envy, too! That is just super pretty.
Major kudos to you!