I think they're separate persons, but I also think Cindi would feed Darrah some stuff at times when she got in over her head.
Cindi may be gullible, perhaps appallingly so, but she's not a complete idiot. I also don't think she's the type to call DSS on somebody, given her friendship with the likes of AC Cream.
There's also the whole Amber Lynn thing: Darrah was offended by Lynn's behavior while Cindi defended it. (Yeah, I know, when isn't Darrah offended by something or other, but you get the point.) Cindi seems to think the best of even the worst people. AC, Amber Lynn, El Burro, and, of course, our favorite new blogger. Makes Holly look like a curmudgeon by comparison.