She put the beat on and the lyrics just flowed.
Copy a song entirely from memory What would it sound like if you tried to re-record Bohemian Rhapsody right now without listening to it to refresh your memory? And having less than frequent moments of inspiration is not an indication of a lack of imagination or songwriting skill.
You might not come up with anything decent, but at least you sat there and fought the resistance. What about the verse?
When it comes to songwriting simple is always effective. It has gone platinum 5 times in the US alone. Never let not playing an instrument hold you back in song-writing! But can you compose music even if you have no exceptionally inspiring musical idea, no inspirational musical fragment in your mind?