I expect Rosenberg and JDW were originally planning to kill Polaris off. Then they realized how people would react and did a little tweaking to avoid backlash.
I can also be reached on BlueSky and Tumblr. Avatar by kahlart.
Ghosts of Genosha minicomic focused on Polaris, written by me and drawn by Fin_NoMore.
Polaris 50th anniversary minicomic written by me and drawn by Mlad!
Gallery of Polaris commissions (without NSFW or minicomics)
She doesn't have to be enrolled in a school to be a student. Teacher and student can be roles outside of a school setting. Banshee was acting as the teacher there secondly she is a member of generation x she's listed as one on anniversary issues to trading cards. Its also clear from subsequent stories thst Emma considered her a student of hers from the necrosha story.
Thirdly the premise of your question is debunked with Emma having a kind and meaningful interaction with Jubilee in Wolverine and Jubilee