Greek mythology

My sister was a white witch - who has recently committed suicide.
I believe she is haunting my family.
Her jewelry & things are jumping off of posts & out of boxes and scaring us. How do we get it to stop?
We've heard white sage can help. How do we purchase & how do we use it?

Just tell her when these things are happening - to go rest in peace. Continous Prayer Crucifix & holy water - no witch has the power against. Goodluck