Generally speaking, if I would describe myself as "not a fan" of someone, I am completely ambivalent about their employment status. For me to be happy about someone getting fired, they would have to have done something that I found objectionable. The way your post read, the thing that she did that you found objectionable was... not distinguish herself from a couple dozen other blonde women on television? Like, she wasn't even actually bad at her job? She just failed to stand out in a crowd? And for that, finding out that she got canned brought a smile to your face?
The first time I'd ever heard of Ashley Brewer was reading your post. Even with you posting a picture of her, I wouldn't know who she was if she were standing next to me wearing a t-shirt that said, "I'm Ashley Brewer" on it. So, I'm not caping up for her so much as I'm taken aback by the reason you expressed for being happy that she lost her job. If someone I was merely "not a fan" of lost their job, I wouldn't even find it noteworthy.
I've got zero objections to you being happy someone got fired. I'm happy to find out when people I don't like get fired, all the time. I suppose it's just a matter of, of all the reasons to dislike someone, the one you gave us is one that I'm least capable of relating to.