There is no such thing as healing stones or crystals. Encourage your sister to think more critically in the future, instead of falling for new age nonsense. Why don’t you buy her a good science book on gemstones, rocks and minerals. You’d be doing her a favour.
I can recommend a UK based healing crystals website that ships anywhere in the world. The website address is in the box below.
Find some pretty rocks and tell her they are healing stones.
Rocks don’t heal people, doctors and paramedics do.