What do you mean by 'winder'? What car?
If she just messed up some wires to the power window switch or motor,
that could be a simple fix.
I have never replaced a power unit before but it has been described here.
I believe some of them are rivited in, and have to be drilled out and
with screws. Seems that some of them can hurt you if you don't know
what you are doing, but I don't remember the details.
The car doesn't have mechanical windows, does it?
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