Likely more of a developing stage than a reaction to anything she is consuming. I would not suggest melatonin simply because it could just make her sleepy all day long and that isn't a good state.
She needs training, not medication, and a good start would be working with her on leash so you can correct the behavior as it happens. As she improves on leash she should get more off leash privileges.
She needs training, not medication, and a good start would be working with her on leash so you can correct the behavior as it happens. As she improves on leash she should get more off leash privileges.