Press space key, and then you can either drag Indigo or use the up arrow key to move her to your mouse-pointer. Press the flag for her to talk to you, and then you can Answer! when at the end of backdrop, press down arrow key to go to next. I couldn't make her able to collect the gems, to just pretend she did. once in second backdrop, click on indigo.
This is, of course, WOF Fanfiction! I am defenitely Tui's Biggest fan.