There are two likely possibilities, and it could be both:
As described in James' answer, with the right owner a clutch could be decimated with relatively low mileage. With mileage that low it would take some serious abuse to get there.
The clutch may have been built with low quality components. The Scion xA and xB of the mid 2000's used inferior pressure plate springs. As a result they could weaken quickly and clutch slipping became common even below 10k in some cases. A little Google searching suggests that the Fiat Panda might have a similar issue. I drove my sister's xA like that for half a year careful to avoid slipping the clutch, but it was in no way ideal.
Adjustment could be an issue as well, but since most modern clutches are self-adjusting(it appears the Panda fits this category) I didn't add it as a possibility in this case.
Considering the mileage of the vehicle and a lack of driving history knowledge, it might be a good idea to look at a higher quality clutch for your replacement. A stage 1 aftermarket clutch kit from a reputable brand would prevent this problem in the future if the OEM parts are indeed prone to failure.