It depends on:
a) How bad (deep and/or icy) the snow actulally is - 6in is quite a bit;
b) how the car is being driven and the terrain. A point will come when a 4x4 is needed, but only if it's shod on appropriate (not summer) tyres.
Winter or decent all-tyres makes more of a difference for most cars unless the conditions are terrible and the driver take on more than they and their car can handle. See the Tyre Reviews website for videos of why (on snow) winter tyres on a 2WD car are far better in many circumstances than a 4x4 on summer tyres.
I suspect your friend's case has just as much to do with their driving style and abilities as the car and tyres.
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