I don't get why everyone here in the comments dislikes Angel. She's being so very considerate to Rena! Rena wants to not draw attention, and what better way to do so than have someone else be flashy and demand everyone's attention? She just has to stay out of her way and let her occupy the prince.
Also, how did the prince recognize her? Either they know each other, in which case she should also know him and they wouldn't be introducing each other, or they don't and he shouldn't be able to recognize her since she went to such lengths to look plain and not match her description. And how does the visibility of the sprite work? Aria was supposed to be visible because she was super strong, but she has somehow concealed them from everyone else, so why can the prince see them?