If anything, Tear can then instead use Holy Lance (is faster than Grand Cross) -> Witchcraft (FoF of Enhance Cast) on the first turn. Speeds up the casting of First Aid, Healing Circle (which is probably her healing of choice, now), Holy Lance, and... Well, Enhance Cast, but that's besides the point. It might also work for the Hymns, but she has so much to say during them, the difference really isn't noticeable. The REAL use of Witchcraft would be the 20% increase to the amount of time it takes to cast anything on Yukiko's end for a full TotA minute. If Tear's doubling at any point, it's after that.
Tear Turn 1: Holy Lance -> Witchcraft
Tear Turn 2: Holy Lance -> Fairy Circle (Healing Circle healing, but with damage on the side!)
Of course, throughout that, I'm pretty certain Yukiko's healing the whole time, for fear of eating the mentioned Grand Cross -> Fatal Circle for the loss.
Then...
Tear Turn 3-?: Nightmare
Turn double: Nightmare -> Frozen Hammer, then Grand Cross -> Fatal Circle.
...Then again, I could be misunderstanding a LOT, and just missing a few critical details.