User blog comment:Blissfully Disturbed/Conspiracy Theory No. 1: Why Kagura hates Jellal/@comment-3987368-20120707033408

To be honest, your second sub-theory makes more sense to me since the 1st one about her being in love with him doesn't make much sense ^_^

Personally, I think that in building the Tower of Heaven, Jellal cause a great loss to her, maybe through resources, family, or something to that effect.