Don't blame Jackie or her parents. I'm sure the act looked much tamer in rehearsals. Her parents are well known for keeping Jackie away from the weird side of the entertainment business. They're quite protective of her, and are actually quite religious.
I hope you are right about her parents.
As for the scene I described, that was the last straw for me. I had become increasingly disenchanted with “DWTS” over the years, as they had gone from featuring entertaining dancing to displays bordering on the indecent.
As a Catholic, I was totally appalled that they would use the “Ave Maria” — the “Hail, Mary” prayer set to music — in this way. It confirmed my growing suspicion of who it is that the producers of that show bow down to.
Are you okay with the vampire theme in the video you have linked?