Strip away the avalanche of rationalizations that precedes her scheme, and you will find the following truths about Saionji laid bare:
1. She doesn't have any friends
2. She really, really wants to have friends
3. Once she realizes you can be friends with anyone, not just the people your family of rich assholes approve of, she's totally gonna freak
Wanna bet that deep down she knows saving the little girl's life was the right thing to do, and the only thing to do, but she's not yet ready to shake off the indoctrination?