To be fair, as I noted the situation makes it difficult to tell how much of what she did is due to prejudice so it's quite popssible no one in authority actually knows she's let her prejudice interfere with her job.
I'd say the fact that she forced the Wards, who are supposed to be taken care of by the Protecterate, under her own command is probably something she did out of prejudice. She really wanted those kids where she could keep an eye on them. Not because she likes kids, but because she wanted to have more power over them.
Back when I mispronounced her name, I called her "Piggot the bigot" for a reason. Most authors I've read with Wards!Taylor tend to forget that Piggot doesn't like parahumans, is in fact willing to deal with a broken and sick body if she doesn't have to subject herself to a parahuman for healing. Before anybody says that it's because Panacea is a biokinetic, as far as I can tell, the PRT is only aware that Panacea is a healing cape, not a cape capable of producing flesh eating bacteria using five seconds and a bit of spit.
I do like how Piggot is portrayed here, though. She's showing her prejudice a bit, but she's not unreasonable enough that other people can't get her to calm down. I do think, though, that she's probably going to do something to offend Taylor. She's definitely going to remind Taylor of the adults in her life who basically ignored her or made her life worse.
Before I forget, Taylor is going to have to think long and hard about whether or not to agree to Glenn's plan. I don't know if she's realized this, but the moment she agrees to his plan, there goes her personal freedom. Glenn will be able to choose what personality she has to have as a hero, but the problem is that Taylor has no way to separate herself from her hero persona. Whenever she's out in public (she can't hide those ears and tails until she figures out illusions, if she can use them at all), she has to act the same way that she does when she's got her costume on. She can't turn off that personality until she's somewhere out of the public eye. And as a kid and Ward, she's going to be out in the public eye a lot: going out with friends, school, her patrols, and whatever concerts Glenn is probably going to make her sing at.