She does - but there's the nagging feeling that we lost a lot through her not being Saavik. Using a "white hat" character in a major "black hat" role would have had an impact, and they wouldn't have had the guts to use Chekov... But Saavik would have been just perfect.
Oh imagine the gut punch if it had been Chekov? That would have been fantastic. They could have done that too given it was the crew's last shout, and such a bittersweet reveal could have worked given the tone of that film.
That would have been hella awesome...(and hella dark since it's a crewmember we've known for so long being involved in a conspiracy).