You left out the green light over her left shoulder at the party, which is obviously a reference to "The Great Gatsby"
"Gatsby believed in the green light, the orgiastic future that year by year recedes before us. It eluded us then, but that's no matter - tomorrow we will run faster, stretch out our arms farther … And one fine morning -
So we beat on, boats against the current, borne back ceaselessly into the past."
Rebecca has had her boat beaten back against the currents of popularity to the point that she doesn't even know what seat she can take, and yet she continues on into the future with her arms stretched out. Her message is one of despair combined with hope for her Heather-riffic future.