Girlfriend has a fetish and is angry about me not sharing it

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So I've been with my girlfriend for about 2.5 years and within the past half year she's been increasingly more open about sex in general and what she wants me to do to her (she also asks me what I want). I love the fact that she's been so open about sex. We had some trouble in the past but this openness really improved it.

Whenever she asks me to do something that I don't want I simply say 'no' and she's cool with it. However, on Thursday she asked me to shit on her chest after I cum inside her. I wasn't weirded out or anything - I understand that if that's what's she's into then whatever. I told her I don't feel comfortable doing that because I'm not interested in poop. She responded "okay fine" and went to the bathroom or something. That was an unusual response because it felt like it REALLY disappointed her, but I didn't say anything to it or bring it up at that moment.

Now it's Sunday and I can barely talk to her without seeing her make a bitter face.The next day I asked her if it's about the shitting on chest thing and he said yes, but she also said "don't worry it's fine" and cleverly changed the topic to make it awkward for me to bring it up again.

What the fuck did I do? I'd always tell her I'm not comfortable something if I felt that way and it used to be completely fine. I don't wanna shit on her chest because it's gross to me. Like, I'm not sure what to do? Should I keep bringing it up or what?