anyone else stuck at investigate the hill path?
When you go to the hills and click on the footprints you get the hint to follow them by scent.
So you need the wolf.
Therefore go to the hideout, select the wolf as your companion, then go to the hills and click on the footprints on the ground.
Edit:
Also when Zana is captured by the humans you might get stuck in the quest to go the farms with Idril as your companion.
That happens if you have selected Idril as your companion before you got the quest to go to the farms with her.
In that case go to your hideout, select the wolf as companion and then switch back to Idril as companion.
It seems the trigger for the game is set to recognize it only if you switch your companions to Idril as companion after receiving that quest.