Often times, the hardest place to be a Christian is at a Christian School.
I went to one from 6th-12th grade. I think we had about 200-300 people in the high school, and the biggest class ever to graduate[2004] only had 90 people in it.
I will warn you though, if it is a small school that goes from 1st-12th grade, there will already be cliques set up. And those groups are going to have a hard time letting "the new girl" in.
As for learning how to read the Bible, chapel, daily prayer, etc...
if she does not do that already, then you run the risk of making it commonplace.
I know that I got burnt out of going to chapel, praying before every class, etc.
It was the hardest thing to make myself d Bible Studies, etc...b/c in my mind it would have been overkill. A Bible class every day, chapel every tuesday, prayer before each class...in total immersion, where you have no choice in anything you do.
And to tell you the truth, even though I went to that school, I was not really saved until college[freshman year].
I say freshman year, b/c that was when I had to make the choice to participate in those activities. And it isn't my friends from HS/JH that led to that choice...it was my college friends. Who really meant what they were talking about, and believed it, and lived it out.
Junior high is such a tumoltuous time in kids lives.
How big is the school? I only aak b/c if you send her to a small JH, and then a large high school, the culture shock will be huge.
Bottom line? Ask your daughter. She is the one that will be going to this school, NOT you. She is the one who will have to break into the cliques/peer groups that already exist.
If you are raising her with the right upbringing at home, then a Christian school should not be neccessary.
Bottom line? Ask her. Please.