This morning, I didn't pet my cat like I usually do.
What was your reason for neglecting to pet your cat this morning.
I am still kind of mad at her for peeing on my bed this previous night.
It's understandable to be frustrated that she peed on your bed. By the next morning, though, she has no idea why you're withholding affection, and it just seems mean. It would be better to look at why the negative behavior happened, and respond to it in the moment, otherwise, you risk damaging your relationship with your pet.
I never ceased to pet her for peeing. I'm just getting back at her.
It makes sense that you want to reprimand her so she does not pee any more in your home, however you should treat your cat the right way. You decided to adopt this cat, and for this reason you should really be doing the best that you can do to take care of her.