“The postmodern choreographer and director came to prominence in the 1960s and ’70s, first with Judson Dance Theater and then with her own eponymous company. She shut down her troupe almost two decades ago to work as a freelance director, relaunched it nine years later to stage a couple of revivals … and then just kept going.” Rachel Elson talks to Childs about how having her own company has been different the second time around and why she’s decided to stop.