If you went bankrupt then the details would be in your local paper. In the case of an IVA it is no concern of any other person, although you should inform your employer. If this woman tells all and sundry there is probably not a great deal you can do, if she told lies about you then you could sue her for slander, but the thing is it would be the truth. What a cow, my guess is that in these times, there are probably quite a few of the parents, and possibly some other teachers who have an IVA running, so don't feel ashamed.