ye i hope she isn't really her real mother but i doubt it. usually adopted parents in manga are always more caring especially in something like a shoujo manga.
I had this theory also, though in my twist, the dead sister had taken Saena's boyfriend away, which is why Saena hates Kyoko.
Ｙｅａｈ， Ｉ ｄｏｕｂｔ ｉｔ ｔｏ， ａｔ ｆｉｒｓｔ．
Ｂｕｔ ｔｈｅ ｍｏｒｅ Ｉ ｔｈｉｎｋ ａｂｏｕｔ ｉｔ， Ｉｔ ｍａｋｅｓ ｍｅ ｃｕｒｉｏｕｓ ｗｈｙ Ｓｅｎａ ｈａｔｅ ｈｅｒ．
#－.－)
ｙｕｐ， ｔｈｅｒｅ＇ｓ ｓｏｍｅ ｔｗｉｓｔｅｄ ｉｄｅａ ｉｎ ｍｙ ｍｉｎｄ：
１． ｋｙｏｋｏ ｉｓ ｈｅｒ ｄｅａｄ ｓｉｓｔｅｒ ｃｈｉｌｄ， ａｎｄ ｈｅｒ ｓｉｓｔｅｒ ｈａｄ ｔａｋｅｎ ｓａｅｎａ＇ｓ ｂｏｙｆｒｉｅｎｄ ｏｒ ｗｏｒｓｔ ｆｉａｎｃｅｅ ｍａｙｂｅ．
２． Ｋｙｏｋｏ ｉｓ ｈｅｒ ｄｅａｄ ｓｉｓｔｅｒ ｗｈｏｍ ｓｈｅ ｈａｔｅｓ ｓｏ ｍｕｃｈ ｂｅｃａｕｓｅ ｔｈｅｙ ｐａｒｅｎｔ ａｌｗａｙｓ ｃｏｍｐａｒｅ ｔｈｅｍ．
ｍａｎｙ ｐｏｓｓｉｂｉｌｉｔｙ (〜￣△￣)〜
ｎｏｔｅ： ｐａｒｄｏｎ ｍｅ， ｅｎｇｌｉｓｈ ｉｓｎ＇ｔ ｍｙ ｆｉｒｓｔ ｌａｎｇｕａｇｅ．
Geh!!!In each of the cases it's not the poor childs fault to be treated that way!Even if shes not her mother she should have at least told her that instead of ignoring her and criticize her since she was young.So in my book in any case shes a coldhearted bitch and no matter what happens and no matter the reason Yoshiki-sensei is gonna give later i dont think i ll change that opinion, cause Kyoko was suffering for the tenderest of her years..
yeah, it's true.
she's totally a bitch. (╬￣皿￣)凸
what if, kyoko really isn't her child, like her sister's child or something and kyoko's parent die in accident, that's why she despise her so much because she thinks kyoko is a burden?
just my theory (〜￣△￣)〜