What is the meaning of She put that bottle to her head and pulled trigger finally drank away his memory from song Whiskey Lullaby by Brad Paisley?

In the song "Whiskey Lullaby" by Brad Paisley, the line "She put that bottle to her head and pulled the trigger" is a metaphor for her drinking alcohol to escape her pain and forget about the memories of her lost love. The phrase "pulled the trigger" suggests that she has made a final, irrevocable decision to drown her sorrows in alcohol.