I just read the wikia page for lucy and apparently, she had a whip as her weapon of choice along with her zodiac keys. The fist one was normal and the second one was a celestial type given to her by virgo.

Whatever happened to it? 🙁

Lucy is for plot development and comic relieve, so there's no real point to make her strong, if there's a way to make fun of her with the whip y will see it again 😀

..and fanservice; don't forget fanservice.

That being said, I would like to see her grow in ability to some degree. At least increase her magic capabilities or something.

Her whip will appear on her person when the plot demands it, but otherwise it's usually nowhere to be found. She won't have it in one panel, but she'll have it in the next panel.