I'm thinking of hiding my mother's things around the house so she can't find them.
What would compel you to hide your mom's stuff?
She's so mean and I hate her.
Having a cruel mother is hard. However, hiding her things so she can't find them is just as inconsiderate. Forgive your mom and find it in your heart to understand that she is imperfect.
I hate my mom and I will never forgive her. She's a really terrible person. Also, fuck you.
You need to work out your issues in a more normal way. Hiding people's stuff is immature and you need to find a better way to solve this issue.