How does Greta respond to meeting one of her fans on the cruise in the novel, The Unsinkable Greta James?

Preeti is the young fan Greta encounters on the cruise. Throughout their time on the Escape, Greta and Preeti repeatedly run into one another. One night, Preeti spies on Greta while she plays guitar. Instead of shooing her away, Greta invites Preeti to play with her, even teaching her one of her songs. Then, during the variety show, Preeti plays one of Greta's songs on stage. When she starts to struggle, Greta joins her on stage and plays with her. The experience inspires both Preeti and Greta and awes the audience.