In Operation 002-C, if you fail Wonder Pink's quick-time event near the end of the mission, Wonder Pink will pull out her phone and start having a sped up conversation. Failing this event 10 times in a row will actually play the conversation in normal speed and reveal that she is talking to Wonder-Cheerleader.

Wonder Pink: Oh my god! What's happening girl?
Wonder-Cheerleader: Nothing, girl.
Wonder Pink: How's Joe?
Wonder-Cheerleader: He's good, but he stood me up last night! Said something about the last movie in a red hot trilogy!
Wonder Pink: He did what? Tell him to quit going to the movies all the time. Such a deadbeat!
Wonder-Cheerleader: I know.
Wonder Pink: No, I do not think he is red hot... You are a crazy girl.

This conversation heavily implies that beyond physical similarities, Wonder-Cheerleader is actually Silvia from another Hideki Kamiya directed series Viewtiful Joe (both characters are voiced by Christina Pucelli), and that “Silvianne Lumiere“ is just an alias. This is also referencing the unmade third game in the intended Viewtiful Joe trilogy.