I'm assuming the division in which they are in is determined by school size. It just so happens this school is MUCH smaller than most small schools. I read this school, specializing in kids with leaning disabilities only have 20 in total attendance!
And maybe winning isn't everything to them. Maybe they just like the opportunity to play the game and learn. They shouldn't have to abandon the league because they can't compete.
Then they need to find other teams to play against. 100-0 is bad, but look at the scores of their other games. 55-6, 66-4, 49-7. This is not basketball.
The coach should make his own AAU team and include the girls, then he could find leagues/tournaments at the appropriate level.
Sandra