All of the voice training in the world will not help if she doesn't have an ear, and from what you have described, this is the likely scenario.

Good luck,

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)