We didn't use the rubber puzzle pieces for college (not there yet), but did use them in my kitchen when my kids were learning to crawl (better grip and softer for falls).
Overall, they held up well for wear. Walking on them continually, etc. wasn't a problem. The only problem we had was with the dog's toenails digging in or her digging at the pieces.
The biggest issue with these rubber pieces is that they are difficult to clean, especially if you get the ones with a little bit of texture (which is most of them). Remembering my college days, I have a feeling they are going to get pretty gross pretty quick and not cleaned well.
If it's the padding she wants, get the rubber pieces and put them under the rug. If it's versatility and fun, check out the new carpet squares that you can put down and rearrange.