Hero wont use items/abilities

Not sure if this is the right place to ask this question, buy anyhow, I am making a singleplayer campaign map, and i want the enemy hero to use its items and abilities when attacked. The hero used to use em, but somehow, she wont do it anymore. I have tried to set a ai for the computer, but it doesn't work, the hero dont do anything, and computer moves around units it is not supposed to move around. Do anyone know what might be wrong?

I only know of one way to make the enemy hero use its abilities.

In the world editor, set the hero on the map, double click it and go to abilities. Now click active on the abilities you want it to use, and set their level. Test the map and go to where you set the hero. It should now use its abilities.

It should, but it dont. It is really frustrating. But thank you for trying to help :)