I think than that will be part of the bigger story. After all spoilers:end of spoilers
the Batwoman who Laughs, who is the Batwoman of earth 11 corrupted and not a dark multiverse copy, made her debut in JLIncarnate.
Still, even if Dorothy wasn't returned and that other character is compromised, I think maybe Rhea could return in the next Doom Patrol series, if a new series in on schedule.
You should had check the Doom Patrol story in DC's Ghouls Just Wanna Have Fun. The writer there put in context the whole story oif the Doom Patrol in a very respectful and touching story.