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I'm not sure her TM is actually the way to go on her and she may be better off with a TDH accessory instead.
Notable stats on her TM + TM ability give her 45 flat atk, 30% atk, and 45% LB damage. The LB damage increase will likely be additive with her 300% LB damage buff for a 15% increase in damage total. The 45 flat atk is only 20 more atk than a TDH accessory leaving the 30% atk as the real draw.
When taking everything into account, unless you're looking to absorb lightning damage (great for Ultros, btw) I don't think it's necessarily better than other alternatives.