My cousins and aunts came to visit for my brother's wedding and I don't know what to do, I have one cousin (we are not close at) who has been getting really comfortable in my room, laying down in bed randomly for hours on end , sitting with outside clothes on the bed and leaving her stuff everywhere and making a MESS (she left her HANDBAG she wore outside and LEFT ON THE FLOOR ON MY BED and the wet towel from her shower and makeup products on my bed too.) and I cant tell her cuz she will get EXTREMELY MAD and passive aggressive and ironic and holds grudges, she's older than me, she's a adult and I'm 17, I really don't know what to do yesterday because she didn't like her room she came and slept on my bed randomly without even asking me she just got her blanket and just layed down (I absolutely HATE sharing my bed with people) I don't know what to do I feel like I'm loosing my space, maybe I'm overreacting? And what can I do ?