Am I the only one who noticed this...?

It seems that Adventure Time's season 4 seems to be centering more and more on PB and FP (of course Finn and Jake are included--they're the main characters, obvs). PB had appeared in her episodes--well, that's not so much as a big deal, since she's a main character; FP had three appearances so far. But Marceline???
Last time I saw her it was on the episode "Daddy's Little Monster" then after that...Nothing much to it.
Where's Marceline, damn it? She's a main character, too--she's also one of the characters in the opening sequence!
As much as like Finn, Jake, FP and some others, I demand Marcy gets her screen time! I like her, too! >:(