Help Please, this lime butterfly is unable to fly and is sitting for an hour.

Today this morning, I saw a big lime butterfly sitting at our veranda. She is not moving at all. She is in the same position for like an hour. I think she has some wounds and is unable to fly. I don't know what to do. This is the first time I have seen a lime butterfly and i couldn't help her. Can anyone suggest how can I help her?