Apparently, there were times when she did villainous acts including hurting or incriminating the babies. Btw, Inferno Pendragon has mentioned that Angelica is a villain and goes far beyond being just a brat. In fact, she apparently does an evil laugh which is pretty villainous. Also, she did commit crimes such as theft, kidnapping,etc.
Inferno is blocked across wiki at the moment but Angelica has played villain in several retellings of stories, used a voice changer in one episode to order several thing under another's identity (I think her mother mainly) and willingly helped Coco in the movie for a parade and merely drew the line later out of guilt and being betrayed. From what I remember she does more then simply be a brat and yell.