Final answer:
Abby announced she was going to jail in Season 7 of Dance Moms.
Step-by-step explanation:
The announcement that Abby was going to jail was made in Season 7 of the reality TV show Dance Moms. In the show, Abby Lee Miller, the dance instructor and owner of the Abby Lee Dance Company, faced legal troubles and was sentenced to prison for bankruptcy fraud. This happened in 2017, and the events were documented in the episodes of Season 7.