As I said in the other thread on this topic: What the school did violates the tenets of Christianity, foremost of which is the need to minister to the spiritually needy. I'd call the teenaged daughter of lesbians as spiritually needy as they come.
The proper response would have been to intervene and minister to her. To get her to understand the evil and sin that her mother was committing. If they were worried about the appearance to the other children, they could have explained that the girls parents were sinners and that the girl needed their prayers and support. It could have been an excellent teaching moment, but instead turned into an un-Christian rejection of Jesus teachings.
A real Christian never turns his back on a sinner, and certainly doesn't turn his back on someone because they're forcibly associated with sinners. Our duty is to spread the light and the Word.
And BTW...
It is to love God.
2) The school has been ministering to this girl for years and by her statement in the article, she has failed to accept and apply their spiritual counseling
and
3) Jesus Himself rejected unrepentent sinners who were proud and defiant in their sin. He referred to some of them as a "generation of vipers." Others he threw out of the temple -- just as God threw Satan out of heaven and just as OCS threw this unrepentent family out of their school.
You don't sound very familiar with Jesus' earthly mission, if I may say so.