It’s available on mobile apps stores I believe.

You need to romance her before entering the cursed lands.

Approval needs to be high enough then she will ask to see each other after everyone goes to sleep.

Easiest after goblins/grove interaction during the party, but not necessary. In an evil play though I romanced her in grymforge.

I just cast from top of the elevator by the tree. Fly the hand so it is on the idol. Throw idol down the hill. Pick up if out of site. Throw again if necessary.