Skyrim Companion’s quest “Striking the Heart.”

This could be what your looking for. More info would allow for better answers :)

If you go through the stages, go through the door to where the initiation is to start, and a hagraven and a hag in Illia's Mothers place Illia will continue into battle alone killing both of them. If you encounter this Illia's Mother will not appear, not starting the initiation process, she will then return to the top door (If you try to interact with her she will be a blank npc not offering options) ending the quest as unfinished.

PC Note This can be fixed by prid 0004B47C, enable. Silvia will appear and act hostile but will not initiate combat. Once you attack, Illia will join the fight and the quest will be marked as completed once Silvia is dead.

Taken from uesp.net

Well I had that problem with a civil war quest what I did was start from the beginning of the game and when I reached that point everything progressed as normal so that's what I suggest you do try starting over from beginning of the game and that should help you out.