You can hatch a plain closed boundary as long as it is placed on (or it is parallel with) the XOY plane. It is not important the direction of view. If the ellipse had one axie parallel with the OX and the other with the OZ plane it is placed on the XOZ plane. In this case rotate the UCS around the OX axe and than you can hatch.
Please tell me: do you begin all your messages by pasting the “header” from somewhere?