She means that whenever they find out the truth they will turn against what they thought was right and become their allies. I would hope she became right. I don't actually know what this play is.
The reason the color wheel is an important tool for artists is because it displays the relationships between the colors. In general, the way the colors contrast with each other can be defined as either analogous or complementary
The conflict of “The Corpse Bride” character vs self because Victor doesn’t know if he should pick Vitoria or Emily to be his wife. The reason why is it is character vs self is because Victor developed feelings for Emily which makes it hard for HIM to choose.