MiniJack goes to new S'dale High, gets stuck in magic tunnels *found*

Just got new laptop and trying to find old favorites. This one is a long story or series where Dawn is creating her own little circle of Scoobies, one of who is Jack O'Neill's clone. Dawn and a friend fall through a hole in the school bathroom floor and end up in a tunnel that keeps moving around so they can't find a way out. MiniJack and one or two others are also stuck, as well as Faith, who's a school counselor. They get help from Willow before the zombies get them. Turns out some kid is using his mother's magic items; she gives him hell for it.

Another scene I remember is Dawn's groups going to a school field trip to (I think) a museum, using it as several school assignments. MiniJack is disturbed by too many familiar Egyptian artifacts and scenes and calls in SG1 to deal with them before someone gains enough power to use them.

Hope you can help. Been looking for 3 weeks with no results. Anyone know this story?

*Quickest way to find what I'm looking for is to put out a plea for it here. Got a lot of the details wrong but it took me ten minutes to stumble over part of the story. It's all part of the Dawn Winchester verse by Dragonfan (or Steamfan, depending on what site you're at) at Twisting the Hellmouth. I like and recommend this author's Buffy and Supernatural (with other fandoms thrown in) stories.