User blog comment:Miskos3/Fairy Tail Episode 189: Gloria, Review/@comment-112.198.82.48-20140705190207/@comment-7418318-20140705225053

In the manga it was only implied, but far from confirmed.

The anime so far didn't fully confirm it, but they did some even stronger implying. In the scenes at the beginning and end of episode 176 there are times when you can see nothing coming out of Lucy's right sleeve, even though that sleeve only goes to the wrist on her left, hinting very strongly that her right hand is gone.

You also see a closeup of the hand on the ground, but then Lucy is shown standing or kneeling... not sure which one, but either way in no position in which her hand would lie palm down on the ground.