Hey Kate, your crazy sister is alive! Surprise! Turns out Chase found her, after it started to come together that Kate was Batwoman. She started looking into anyone who crossed path with Kate, and eventually got in deep into a Religion of Crime stronghold with some DEO agents, were attacked by a surprising amount of cultists, and was the only one to make it out alive. In the aftermath of that fight, Chase came across the sarcophagus that held Beth, and the DEO hasn't even been able to figure out how the thing kept her alive.
All of this, well, it sort of pisses Kate off, as she attacks Bones, pointing out to Chase (gun drawn) that it was the DEO who gave her a bulletproof suit. Kate calms herself a bit, and asks to speak with her sister. Kate is granted a few minutes to speak with Beth, who comes off a bit normal, but as Kate is requested to leave, her voice changes back to creepy, given the lettering change.
So, Bones has a new bargaining chip, claiming the DEO can fix Beth. Figure out who Batman is, and Batwoman gets her sister back. Kate agrees to the deal, but adds the stipulations that once complete, the DEO will erase everything they have on her father, and she'll never work for them again.
Kate returns to her and Maggie's apartment to find not only Maggie, but her father, stepmother, and cousin waiting for her. Bette had planted a bug on Kate earlier, and they all heard what happened. Kate gets crazy defensive, but everyone just wants to bring Beth back, and help her out. It gets to the point where Maggie finally points out that Kate lied just as much as her father, and needs to stop being a martyr, or she can leave.
Given the proposition, Kate gets off the cross, as Maggie would put it, collapses on the couch, and is willing to accept her family's help.