This is the list:
Maria's bloody shawl, ashes from a tomb beside a wild rose bush, also at the cemetery in Martha's mauseleum a ring, rose from the rose bush on the side of the road going to the castle, the forked slingshot from Ionel and berries found in front of the castle.
So visit the cemetery and look for those that can be found there: ashes, ring.
Walk the road to the castle and get the rose; then pick the berries.
Talk to Ionel and see if you can get the slingshot.