1. Divine guidance: Goddess Guanyin is one of the Buddhas, symbolizing compassion and wisdom. Dreaming that she is holding the red line may indicate that she is leading you to a better interpersonal relationship or finding true love. Traditionally, the red line is also regarded as a symbol of blessing and fate.
2. The arrival of fate: The red line is often used to describe the fate of two people in China culture. Dreaming of Guanyin holding the red line may mean that there will be new interpersonal relationships or people with special significance in your life.
3. Desire for love: Goddess Guanyin holding the red line can also be interpreted as your expectation and desire for love. It may reflect your desire to form a red line of beautiful love between two people.
Please note that this is only a common explanation, and the specific meaning needs to be understood in combination with personal circumstances. If you are troubled by this dream, or need further interpretation, I suggest you consult a dream analyst, or refer to relevant literature for a deeper understanding.