@Vance Ashworth If I can recall correctly it seems like Catherine got kind of pressed into playing the villainess. After she discovered her real mother was Alicia while she was all cozy with her father, they threatend and pressured her with what might happen if Diana was to find out she is not her true child, she may lose everything. Like they would tell her, so she should just play her role and everthing will work out. Also Catherine once thought she doesn't care who her real mother is, as long as she can marry this Sawyer boy, so I believe she got no lingering feelings for her real mother aswell. Deep down I think the mothers are quite equal for her, the one it the mother who raised her, who she spend all years with and the other is her real mother, a bond exists even with no history together. Due to the role she was forced in she acts pro actively towards her real mother but in reality she doesn't care about this. I end up having a bit of sympathy for her but also don't like what she did, these are mixed feelings about her