There's no need to question what you did. I probably would have done the same thing. I'm sure Lilith knew how much she was loved and understands. Losing a special furry friend is hard. I'm sorry you had to make the choice. I had to make that important choice when I was a teen and my parents were out of town. It's one you never forget but it's also an act of love because it's done for such non selfish reasons. Don't beat yourself up over it. Just take one day at a time and soon you will be able to remember the happy times without being sad. We're all here for you if you need us.