Found a paper under bed

Assalamu alaikum, A friend of mine recently found a paper wrapped in cellotape underneath her bed. The paper had red writing all over it, I have a picture but do not know how to attach it to this question. On the paper there is a grid with numbers within each square. There is also some Arabic around the grid. Is this a bad taweez? Why would it be placed underneath her bed without her knowledge? She wants to find out the meaning of this taweez? Also who placed it underneath her bed as she lives with her in laws? How can she get rid of this in the beat safest way? How can she protect herself? Thank you