#BlackCat Evangaline was changelinged out for Rosalee by her mother. Willow relized right away that Evan wasnt hers. So she went in search for a WItch that would help her find her daughter. Meeting Olivia she was able to find Rosa named Summer. It turned out that the woman just wanted to be with Rosas father which was just fine with Willow. She wasnt able to get Rosa back till 5 years later when she came to relize that things werent right. Evan and Rosa are half sisters. Same father.