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Random speculation
Maybe Yukina wont join Fairy Tail. Maybe she joined Mermaid Heel and Kagura just ordered her to give up her old "sword" since she defeated with that one and it represents her old life. Plus Kagura cant own and train a mage whos mage she isnt fimilure with, so Kagura will train Yukina in some new magic. However since Yukina is a good spirit mage she cant just trow out the keys so she sought out Lucy whom is clearly a well loved spirit mage since she cant bare the thought of her keys going to a possible bad master when lucy is right there and a clear good master.
Then again Yukina could join Fairy Tail but since shes owned by Kagura (and will find out about her hatred of Jellal) she'll end up in a position where she discovers who Mystogan is and ends up telling Kagura who she is in order for payment of her life back (though more likely alludes to getting her life back if she finds Jellal for her but Kagura being a smart cookie figures out its someone in Fairy Tail). If she sells out Jellal it will likely be since she believes hes an evil mages as everyone but Fairy Tail believes, she may even believe Jellal defeated Mytogan and replaced him during Fairy Tails 7 year absence and Fairy Tail just hasnt figured it out yet
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