Roommate is giving me the cold treatment after I finally set a boundary about her using my dishes

I’ve been trying to be less "rigid" and more lenient with my new roommate to keep the peace. She constantly uses my utensils and leaves them unwashed for days. I’ve given her multiple polite, soft warnings, but she ignores them.

Today, I found a spoon she’d used and left dirty for 3 days. I asked her to wash it; she said yes but didn’t touch it for hours. I finally snapped, washed it in front of her, and texted her to stop using my things entirely.

Now, she’s giving me the silent treatment and acting like the victim, even though she's the one with the unhygienic habits. It’s creating a heavy atmosphere in the room, and while I’m glad I stood up for myself, I’m struggling with the "chilly" vibe. How do I stop caring about the approval of someone who clearly doesn't respect my space?