Apparently, it wasn’t so long-term. I am assuming that they were assuming (correctly so) that the problem would be resolved soon and therefore it wouldn’t be in their childrens’ best interests to try to find another school for them.
If it had lasted a really long time, I’m sure they would have tried to find another school. I’m also sure that it would have been really difficult or impossible to find places in other schools for all the girls (or at least it would have taken some time).