I’ve never had bangs, but everyone I know who has had them tells me that they require additional upkeep.
No one who was as messed up as Cassie was in Season 1 is going to be able to maintain the perfect, stylish bang for long.
So, this is probably a little hint to viewers that Cassie has been on the straight and narrow for a while by the time we meet up with her again in Season 2.