abby lee miller says she's ready to be back in the spotlight. the former "dance moms" star has been both celebrated and denounced for her strict disciplinary approach to training young dancers. she served time in prison for tax evasion and battled cancer. can abby lee's comeback be greater than her setbacks? here's "nightline" coanchor juju chang. >> hello, everybody. right here, make a circle. hurry up! music, go ahead. five, six, seven, and lift -- forward, go -- >> juju: abby lee miller still knows how to command a room. >> now we're down to the chosen few. here we go. good-bye. good-bye. good-bye. going to let you go. 478, you're done. 276, you're done -- >> juju: now 58, the disgraced former star of "dance moms," the reality show that seemed to pit stage moms against each other and abby. >> whore! >> juju: abby became a cultural phenomenon. now she's trying to make a comeback. abby's changed in so many ways. surviving a stint in prison followed by a cancer battle that left her in a wheelchair. but in other ways, she's exactly the same. >> d