Wish I knew. When does Chloe get to corrupt Diane? I'd like to see how Diane would get into the club. Maybe Chloe could persuade the doorman or ask for the mother's help to distract him. I don't see her taking Diane to play D&D. Could reopen the massage parlour and get Diane to sweep floors/clean up and accidentally leave doors open.
That's the thing, though. Continuity between BTC and FF is a little bit... off. Here's Diane in BTC, where, as you can see, her mother is Taylor's mother in FF:
Clearly, something has to change there. And here's Diane in FF, where obviously, something has changed about her in the meantime:
Based on things GDS has said (either here or in the FF thread, don't remember) I suspect that Diane may have originally been meant to be Kayleigh?
But either way, I wouldn't hold my breath for a BTC update. I think it's going to be Fake Family going forward, wish it were otherwise, but what can you do.