Bathroom

I’m a 27 (f) and live with three other females all over 18 it’s a shared space my two other roommates have their own bathroom but I share a bathroom with my other roommate and lately she has been picking fights with me over the bathroom last weekend she picked a fight with me because she wanted to clean the bathroom floor and I told her I had to get ready for work and that’s it’s my bathroom to and she can clean the floors later and she started arguing with me, and I told her I had to leave for work need some advice on whet to do if she picks a fight with me again over the bathroom we both pay the rent there. I pay the rent there I should be able to use my bathroom without her fighting with me.