No, this is not just a harmless hobby -- not at all. The reason is simple: Instead of trusting God (which is what we all should do), your cousin is putting her trust in things that cannot help her. The Bible bluntly declares, "This is what the Sovereign Lord says: I am against your magic charms with which you ensnare people" (Ezekiel 13:20).
Think of it this way. Our lives are filled with uncertainty and danger; none of us knows what the future holds for us. But how will we respond? Will we respond with worry and fear, constantly anxious over the future and wrapped up only in ourselves and our problems? Or will we learn to trust God, committing our lives to Him and asking Him to guide us and give us the wisdom to deal with life's uncertainties? Which will it be -- fear or trust? Sadly, your cousin has chosen fear, and she lives in a constant state of anxiety.
But God shows us another way -- the way of trust. God loves us; He loves us so much that He wants us to be part of His family forever. And he made this possible by sending Jesus Christ into the world to die for us. Once we understand how much God loves us, our lives will never be the same.
Pray for your cousin, that she may commit her fears -- and her whole life -- to Jesus. The Bible says, "Cast all your anxiety on him because he cares for you" (1 Peter 5:7).