Mom keeps taking my things

I just moved back home because my mom said she needed help with my younger siblings but she keeps taking all my things I don't even know how she gets them I don't mind letting her borrow but she takes things without even asking from lotion to clothes to my panties 😐 how do I talk to her and tell her this isn't okay ? I don't want to seem rude or disrespectful because she is my mother but it realllly bothers me especially the underwear part🤢