I'm not that familiar with Line6's stuff, but if its one of the POD models that has an "expression pedal" (rocker pedal), it's probably possible. There are several manufacturers who make the multi-fx units with that type of pedal (Digitech is the first one that comes to my mind). I have an RP-80 (old model) which has the expression pedal, and you can assign it as a volume pedal, wah, "whammy" pedal, octave up/down pedal, etc.
You'd definitely get much more use out of a multi-fx and you also wouldn't have to deal with the tuning headaches from the trem bar on her guitar. It will take some practice for her to get convincing 'whammy' sounds using the pedal, though.
Mac
"I wish I could play that fast - then I would have the option of not doing that."
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