It is only hypocritical if the church teaches that such things are sin. Aside from the Catholic Church, I don't know of many that place being divorced on the same level as sex outside of wedlock...
Right, because its up to men and organizations to determine which sins are worse than others, and what the scale is in general. This school had no problem hiring a divorced, single mother. They had no problem with her being a role model knowing that situation. But when she got pregnant, then there was a problem. It shows them to be hypocrites.