My cat is constantly meowing by the door after I let her out once, but it's dangerous for cats to be outdoors unsupervised. What are some ways I can train her to stop meowing?

There are a few different ways you can train your cat to stop meowing:
- Get a clicker, and whenever she pauses her meowing, click the clicker and give her a treat. The clicker trains her to associate her behavior with the reward.
- Find something else to entertain her, such as a cat toy, or a video of wildlife.
- Build an outdoor enclosure for her, accessible from a cat door. This will allow her to go outside, but in a safe and controller environment.