Was this waitress tip inappropriate?

This was a first for us. As we were being seated, our waitress began to tell us how broke she was. That her husband left her for a younger woman and that she was running on an empty gas tank in her automobile. My wife slipped her $5 dollars. About 10 minutes later, I walked back to her and gave her $20 dollars more. By the look on her face, you would have thought she had just won the lottery. Question: was our tip enough or should the waitress have not solicitated money from the customers of the restaurant?