User blog comment:FairyRaven/Fairy Tail Chapter 437: Magnolia, Review and Commentary/@comment-7418318-20150525093151/@comment-7418318-20150525101315

I have no problem with the timeframe. Lucy learned Urano Metria in something around two month and it's the "Ultimate Magic" of the Stars.

Besides Kinana wasn't in the story for so long that she might have finished learning Take-Over even before the time-skip came and she only said she knows Ice Magic now, not how good she is. She might just knew a few basic spells.

But Ice Magic migth help in her former job as barkeeper. No need to store any ice cubes, since she can just makes new ones out of water or even thin air. ^^