Because of this, Cassie has become a stronger person; no more is she the awkward, free-spirited girl who would happily drag on a joint and dance the night away with Sid and Chris, she’s developed into a more bitter being – one who responds with “no” more than anything else.At the beginning of the first series, Cassie is recently discharged from hospital after a suicide attempt off-screen.
..interesting because she has a lot of problems, and she's very troubled, and she's anorexic and completely lacking in self-esteem and self-belief, but along with that she's sort of quite smart.
I think that she has quite a good reading on a lot of the other characters about what they're like and how they work and stuff, and I think she's a very clever girl, and she's also kind of silly and dreamy and quite fun at the same time as being a very tragic character.
The titular second episode of the first series and the penultimate episode of the second series focus on Cassie; the former focuses on her mental state and the latter focuses on her relationship with roommate Chris Miles (Joe Dempsie).
She avoids social contact with her co-workers and flatmates, and refuses to take drugs when offered them (as opposed to her affinity towards them in the past), and secludes herself in her room.
There is (season 4 episode 2) a drawing which strongly resembles Cassie posted at the front of Sophia's room.
This could be a joke made by the producers of the show.
It seems as though every single shred of joy and wonder from her youth has been tarnished; consumed and rejected by the cold realities of adulthood and responsibility.
The show's producers and writers described her centric episode in an interview with The Independent as being about "how she gets through her day without eating ...
how she feels and what her tactics are", and campaigned to prevent any announcement of any counselling helplines during the episode's credits because they "didn't want a little preachy drama where everyone hugs at the end"; instead, the producers hoped that people would recognize their own faults in Cassie.