This is a tough one on many levels - depending on what type of job it is, if you call to reschedule the interview, they'll think "well, it's starting already"! But then if you call the school and tell them you need to cancel, you'll get a bad response there as well.
If this were me, and I've been in similar situations, I would go thru with the interview. Jobs are hard to find these days and you may not get another opportunity.
Maybe when you call the school, you could offer to make a few calls to get a replacement.
If you do go for the interview, I would make a point of taking your daughter out for ice cream or something special - just mommy and me time!!
Good luck!!