Bit hard to see in the photos, but not sure if could come out of bow (usually a complete seam/tunnel of material right across that bow is threaded through)
My first guess would be that bow has dislodged from one side or twisted. Take pinchweld from over door and gently lift off edge of headlining to have a better look. You may be lucky and just have to reseat bow or twist bow to upright position.
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