she is a med student. rotations do not last more than a few weeks tops, so as much as you mightve liked her to still be in the ER full time, this isn't realistic at all four months after season 2. anyone with basic knowledge of the american medical school system would be aware she wouldn't still be there in real life, and the show tries to keep to realism as much as it can.

she would not still be in the ER as a med student. it would've been SO much easier for the writers to say "oh, javadi is on another rotation right now, she's not in s3 but will be back in s4 after graduation", and it also would've made sense to not see her. that's how it is.

INSTEAD, the writers went out of their way to write her with a storyline that will bring her back to the ER and still give her a role since they know how loved she is and like writing her. now, we'll get to know MORE about who javadi is and her passion for psych, AND we'll get a heavier presence of psych in the show as a whole because of it, which is a great thing too!

there is nothing logical to complain about here. the writers have made a decision to advance the storyline of, and keep in the main cast, a character and actress that we all like. be happy about that, narratively they could so easily not have done- insulting and attacking people who are trying to give you this interesting storyline for her rather than writing her off as would make sense for s3 is *insane*.