Yeah, for sure tv shows tend to drop the ball after the initial big dramatic event, but I actually feel like there was at least minimal follow up with Abby's kidnapping (ridiculous that more than 1 character on this show has been kidnapped). She's shown to have taken some time off, have had trouble sleeping, be jumpy and irritable, a handful of characters comment on what she went through and her being gone, she's shown reacting to a man shouting in the hospital and struggling a bit to get back to work. It's only for one episode so it's not like we saw her continued process of dealing with her trauma, but Sam got even less than one episode of follow up. It wasn't even made clear that she took any time off because the week time skip shows her standing around the admit desk acting completely normal, no one welcomes her back or asks her how she's doing (other than Luka who we know wasn't working) so it almost seems like she might have been at work earlier in the week. We don't see her struggling to get back to "normal", she just is all of a sudden. I know the show was infamous for it's catastrophic storylines with little follow through after the fact, but I feel like Sam's situation was particularly glaring. Maybe because I've always had an issue with shows having female characters get raped for drama or as a ratings stunt and then forgetting about it.
Plus I feel like the show missed multiple opportunities to explore the realities of PTSD. There's at least half a dozen characters who experienced horrifyingly traumatic things, either in the ER itself or a way from it, and somehow we never got an in depth look at how post-traumatic stress effects people, which would have been fitting for a medical drama.