She could've told Gracia that Ryley and Clyde were sleeping together and locked her in the basement before, but Rachel knew that the mysterious figure would kill her if she exposed their relationship.
However, that didn't mean she wouldn't do it. Those two deserved to suffer in the worst kind of way!
It's better for her to reveal these secrets slowly, and she knew who she could use later.
Marsha... She would definitely go batshit crazy if she found out about it.
"Wait, just wait a minute!" Marsha interrupted when she finally couldn't stand it any longer. "What the hell are you guys talking about? Drugging? Who's drugging who?" She asked with a baffled look as she looked at Rachel and her sister alternately.
"I feel bad for you, Marsha." Rachel tried to gain her sympathy. "You don't even know what's going on because your sister keeps lying to you."