User blog comment:Omega natsu2/Chapter 361: Two Bombs, Predictions./@comment-7418318-20131122113244/@comment-38.96.245.170-20131122200434

I think it's a yes. Lucy is a celestial wizard and the definition is one that summons a spirit to fight with.

Besides, the spirits rely on the summoners magical energy so she is fishing Jackal. Most people view Lucy's spirits as their own being, which is true but Lucy is fighting as well.