Dawn and Faith trapped in tunnels under school bathroom, Dawn's junior Scoobies at museum

[ladyhatshepsut.livejournal.com]

Help!! I've been looking for this story (I think it's in the same story) for a year and a half.  I'm hoping someone can help me.  The first part I recall is Dawn, Faith, (SG-1's) mini-Jack and a couple of others in Dawn's group taking a field trip to a museum, getting extra credit in their home studies.  Mini-Jack notices too many Egyptian items where they shouldn't be and calls in "his" SG team.  Another part of this tale has Dawn and another student falling into a sudden hole in the floor at a school bathroom, with Faith following to find them with help from a little tracker fairy from Willow.  They are menaced by zombies.  Turns out some student got into his mother's magic stuff and she grounds him for it afterwards.  I THINK this MAY be without Buffy, after her sacrifice with Glory, because I don't remember her being in any of this.