Illia in game dialogue, indicates she wants to leave the Darklight tower: "...I want to leave everything from this cursed place behind. Goodbye. And thank you." However, Bethesda never made her leave the cursed place (Darklight tower) after the quest. This mod fixes that issue by editing her package to have her sandbox in Bee and Barb instead of Darklight tower. I copy out this change from AndrealphusVIII's BUVARP SE RE - Barely Used Vanilla Actors Recycle Project Special Edition Revamped, so all credits to them for the fix.

Note from AndrealphusVIII mod page:

Illia: Will now sandbox in the Bee and Barb in Riften after her quest, Repentance.

Additionally: There are two bugs with Illia, one where dismissed she cannot be recruited again and when made steward for Hearthfire home, she cannot be recruited again. According to USEP, the unofficial patch fixed this. Not sure how they fixed it, but something good to know if you use that mod.

This mod is compatible with USSEP and BUVARP, but redundant with BUVARP installed. I am just too lazy to patch mods for BUVARP so I do not use it, but some changes are too good to not have. Like this Illia change.