She went to the party _______ her dislike for the host.

The correct choice is "in spite of." This phrase is used to indicate that a particular outcome occurred regardless of adverse circumstances. In this context, it suggests that she attended the party despite having a dislike for the host, emphasizing the contradiction between her feelings and her action.

"In spite of" functions as a prepositional phrase that directly highlights the unexpected nature of the action taken, which is attending the party. It conveys that her attendance did not align with her negative feelings towards the host.

The other options do not fit properly in this context. "Although" and "even though" serve to introduce a contrast but require a complete clause to follow and do not directly convey the same meaning as "in spite of." "Despite of" is incorrect; the correct phrase is simply "despite," which similarly indicates that something happened regardless of an opposing factor, but does so less effectively than "in spite of."