I used to think she was being phased out, for a brief while. I'll be honest, I HATE the whole concept of the "Foster's Five"(Mac, Bloo, Wilt, Ed and Coco) because it gives the feeling that Frankie is second-rate and unimportant by comparison; and I originally expressed it by fearing that Mattel would snub her for their upcoming line of Foster's toys. I still kinda am; but what I REALLY care about is for Frankie to continue being a prominent part of the show.
She's had a pretty big role in Season Four, especially the later episodes... and after how she's "paid her dues" recently(i.e: being lied to and deceived in "Bus the Two of Us", and nearly going crazy from stress in "The Big Cheese"), I think she's earned the right to shine in "Emancipation Complication".
I'm anticipating that episode almost as much as the Wilt fans are anticipating GWH.
